|**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 30,2015201420152014(in thousands)Stock-based compensation expense$5,097$5,032$9,465$8,879Income tax benefit(1,936)(1,912)(3,595)(3,374)Net stock-based compensation expense$3,161$3,120$5,870$5,505                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
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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 January 2015, the Compensation Committee awarded68,274SARs 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 30,20152014Expected term of award6 years6 yearsRisk-free interest rate1.6%2.1%Expected volatility59.4%65.6%Weighted-average grant date fair value per share$21.99$29.96                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|                                                                                                                         | Six Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                                                         | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|Expected term of award                                                                                                   | 6 years                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Risk-free interest rate                                                                                                  | 1.6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Expected volatility                                                                                                      | 59.4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|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 the periods presented:Six Months Ended June 30,20152014Number 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 1,279,011$38.77190,763$33.77Awarded68,27439.6388,24849.57Outstanding at June 30,347,28538.947.8$5,107279,01138.778.3$6,803Vested and expected to vest at June 30,339,98038.887.75,019268,45338.538.36,609Exercisable at June 30,191,14935.686.93,433109,92032.717.33,346                                                                                                                                                                                                                                              
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|                                                                                                                         | Six Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                                                         | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|                                                                                                                         | Number ofSARs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Outstanding beginning of year, January 1,                                                                                | 279,011                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Awarded                                                                                                                  | 68,274                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Outstanding at June 30,                                                                                                  | 347,285                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Vested and expected to vest at June 30,                                                                                  | 339,980                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Exercisable at June 30,                                                                                                  | 191,149                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|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, 2015:SharesWeighted-AverageGrant-DateFair ValueNon-vested at December 31, 2014564,332$46.02Granted291,90348.54Vested(201,006)43.82Forfeited(11,003)54.94Non-vested at June 30, 2015644,22647.69The 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 30,20152014(in thousands, except per share data)Total intrinsic value of time-based awards vested$10,126$11,690Total intrinsic value of time-based awards non-vested34,55644,940Market price per common share as of June 30,53.6463.15Weighted-average grant date fair value per share48.5456.56                                                                                                     
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|                                                                                                                         | Shares                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Non-vested at December 31, 2014                                                                                          | 564,332                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Granted                                                                                                                  | 291,903                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Vested                                                                                                                   | (201,006                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Forfeited                                                                                                                | (11,003                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Non-vested at June 30, 2015                                                                                              | 644,226                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
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|                                                                                                                         | As of/for the Six Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                                                                                                         | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|Total intrinsic value of time-based awards vested                                                                        | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Total intrinsic value of time-based awards non-vested                                                                    | 34,556                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Market price per common share as of June 30,                                                                             | 53.64                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Weighted-average grant date fair value per share                                                                         | 48.54                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Restricted Stock Awards, Market-Based, Valuation assumptions                                                             | In January 2015, the Compensation Committee awarded a total of29,398market-based restricted 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 set group of 15 peer companies. The shares are measured over a three-year period ending on December 31, 2017 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 granted was computed using the Monte Carlo pricing model using the following assumptions:Six Months Ended June 30,20152014Expected term of award3 years3 yearsRisk-free interest rate0.9%0.8%Expected volatility53.0%55.2%Weighted-average grant date fair value per share$57.35$56.87
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|                                                                                                                         | Six Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                                                         | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|Expected term of award                                                                                                   | 3 years                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Risk-free interest rate                                                                                                  | 0.9                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Expected volatility                                                                                                      | 53.0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|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, 2015:SharesWeighted-AverageGrant-DateFair Value per ShareNon-vested at December 31, 201483,721$52.98Granted29,39857.35Non-vested at June 30, 2015113,11954.12The 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 30,20152014(in thousands, except per share data)Total intrinsic value of market-based awards non-vested$6,068$7,216Market price per common share as of June 30,53.6463.15Weighted-average grant date fair value per share57.3556.87                                                                                                                                                                                                                                                
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|Non-vested at December 31, 2014                                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Granted                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Non-vested at June 30, 2015                                                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
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|                                                                                                                         | As of/for the Six Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|                                                                                                                         | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|Total intrinsic value of market-based awards non-vested                                                                  | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Market price per common share as of June 30,                                                                             | 53.64                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Weighted-average grant date fair value per share                                                                         | 57.35                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

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