|**Common Stock (Tables)**                                                                                                | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
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|**Equity [Abstract]**                                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan | The following table provides a summary of the impact of our outstanding stock-based compensation plans on the results of operations for the periods presented:Three Months Ended June 30,Six Months Ended June 30,2016201520162015(in thousands)Stock-based compensation expense$6,444$5,097$11,126$9,465Income tax benefit(2,452)(1,936)(4,233)(3,595)Net stock-based compensation expense$3,992$3,161$6,893$5,870                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|Stock-based compensation expense                                                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Income tax benefit                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Net stock-based compensation expense                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions                                              | In January2016, the Compensation Committee awarded58,709SARs to our executive officers. The fair value of each SAR award was estimated on the date of grant using a Black-Scholes pricing model using the following assumptions:Six Months Ended June 30,20162015Expected term of award6.0 years5.2 yearsRisk-free interest rate1.8%1.4%Expected volatility54.5%58.0%Weighted-average grant date fair value per share$26.96$22.23                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
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|                                                                                                                         | Six Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|                                                                                                                         | 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|Expected term of award                                                                                                   | 6.0 years                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Risk-free interest rate                                                                                                  | 1.8                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Expected volatility                                                                                                      | 54.5                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Weighted-average grant date fair value per share                                                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity                                           | The following table presents the changes in our SARs for all periods presented:Six Months Ended June 30,20162015Number ofSARsWeighted-AverageExercisePriceAverage Remaining ContractualTerm       (in years)Aggregate IntrinsicValue(in thousands)Number ofSARsWeighted-AverageExercisePriceAverage Remaining ContractualTerm(in years)Aggregate IntrinsicValue(in thousands)Outstanding beginning of year, January 1,326,453$38.99279,011$38.77Awarded58,70951.6368,27439.63Exercised(114,853)38.71$2,488——Outstanding at June 30,270,30941.867.44,258347,28538.947.8$5,107Vested and expected to vest at June 30,263,54641.707.44,193339,98038.887.75,019Exercisable at June 30,162,89538.316.43,144191,14935.686.93,433                                                                                                                                                                                               
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|                                                                                                                         | Six Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|                                                                                                                         | 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                         | Number ofSARs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Outstanding beginning of year, January 1,                                                                                | 326,453                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Awarded                                                                                                                  | 58,709                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Exercised                                                                                                                | (114,853                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Outstanding at June 30,                                                                                                  | 270,309                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Vested and expected to vest at June 30,                                                                                  | 263,546                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Exercisable at June 30,                                                                                                  | 162,895                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity                               | The following table presents the changes in non-vested time-based awards to all employees, including executive officers, for thesixmonths endedJune 30, 2016:SharesWeighted-AverageGrant DateFair ValueNon-vested at December 31, 2015525,081$50.23Granted267,37957.11Vested(233,269)49.74Forfeited(12,306)55.27Non-vested at June 30, 2016546,88553.69The following table presents the weighted-average grant date fair value per share and related information as of/for the periods presented:As of/for the Six Months Ended June 30,20162015(in thousands, except per share data)Total intrinsic value of time-based awards vested$13,314$10,126Total intrinsic value of time-based awards non-vested31,50634,556Market price per common share as of June 30,57.6153.64Weighted-average grant date fair value per share57.1148.54                                                                                    
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|                                                                                                                         | Shares                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
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|Non-vested at December 31, 2015                                                                                          | 525,081                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Granted                                                                                                                  | 267,379                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Vested                                                                                                                   | (233,269                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Forfeited                                                                                                                | (12,306                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Non-vested at June 30, 2016                                                                                              | 546,885                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|                                                                                                                         | As of/for the Six Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                                                                         | 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|Total intrinsic value of time-based awards vested                                                                        | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Total intrinsic value of time-based awards non-vested                                                                    | 31,506                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Market price per common share as of June 30,                                                                             | 57.61                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Weighted-average grant date fair value per share                                                                         | 57.11                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Restricted Stock Awards, Market-Based, Valuation assumptions                                                             | In January2016, the Compensation Committee awarded a total of24,280market-basedrestricted shares to our executive officers. In addition to continuous employment, the vesting of these shares is contingent on the Company's total shareholder return ("TSR"), which is essentially the Company’s stock price change including any dividends, as compared to the TSR of a group of peer companies. The shares are measured over a three-year period ending on December 31, 2018 and can result in a payout between0%and200%of the total shares awarded. The weighted-average grant date fair value per market-based share for these awards was computed using the Monte Carlo pricing model using the following assumptions:Six Months Ended June 30,20162015Expected term of award3 years3 yearsRisk-free interest rate1.2%0.9%Expected volatility52.3%53.0%Weighted-average grant date fair value per share$72.54$66.16
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|                                                                                                                         | Six Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|                                                                                                                         | 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|Expected term of award                                                                                                   | 3 years                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Risk-free interest rate                                                                                                  | 1.2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Expected volatility                                                                                                      | 52.3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Weighted-average grant date fair value per share                                                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Schedule of Nonvested Performance-based Units Activity                                                                   | The following table presents the change in non-vested market-based awards during thesixmonths endedJune 30, 2016:SharesWeighted-AverageGrant DateFair Value per ShareNon-vested at December 31, 201571,549$63.60Granted24,28072.54Vested(11,283)98.50Non-vested at June 30, 201684,54661.51The following table presents the weighted-average grant date fair value per share and related information as of/for the periods presented:As of/for the Six Months Ended June 30,20162015(in thousands, except per share data)Total intrinsic value of market-based awards vested$1,174$—Total intrinsic value of market-based awards non-vested4,8716,068Market price per common share as of June 30,57.6153.64Weighted-average grant date fair value per share72.5466.16                                                                                                                                                    
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|Non-vested at December 31, 2015                                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Granted                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Vested                                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Non-vested at June 30, 2016                                                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|                                                                                                                         | As of/for the Six Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                                                                         | 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|Total intrinsic value of market-based awards vested                                                                      | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Total intrinsic value of market-based awards non-vested                                                                  | 4,871                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Market price per common share as of June 30,                                                                             | 57.61                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Weighted-average grant date fair value per share                                                                         | 72.54                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

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