|**Common Stock (Tables)**                                                                                                | 3 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 March 31,20142013(in thousands)Stock-based compensation expense$3,847$2,602Income tax benefit(1,462)(994)Net stock-based compensation expense$2,385$1,608                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
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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 2014, the Compensation Committee awarded88,248SARs 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:Three Months Ended March 31,20142013Expected term of award6 years6 yearsRisk-free interest rate2.1%1.0%Expected volatility65.6%65.5%Weighted-average grant date fair value per share$29.96$21.96                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|                                                                                                                         | Three Months Ended March 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                                                         | 2014                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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|Expected term of award                                                                                                   | 6 years                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Risk-free interest rate                                                                                                  | 2.1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Expected volatility                                                                                                      | 65.6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|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:Three Months Ended March 31,20142013Number 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 1,190,763$33.77118,832$30.80Awarded88,24849.5787,07837.18Outstanding at March 31,279,01138.768.66,555205,91033.508.93,310Vested and expected to vest at March 31,266,36938.508.56,329194,68933.388.83,152Exercisable at March 31,109,92032.717.63,24856,43031.048.01,046                                                                                                                                                                                                                                                                               
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|                                                                                                                         | Three Months Ended March 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                                                                                         | 2014                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                                                                                                         | Number ofSARs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Outstanding beginning of year, January 1,                                                                                | 190,763                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Awarded                                                                                                                  | 88,248                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Outstanding at March 31,                                                                                                 | 279,011                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Vested and expected to vest at March 31,                                                                                 | 266,369                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Exercisable at March 31,                                                                                                 | 109,920                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity                               | The following table presents the changes in non-vested time-based awards for thethreemonths endedMarch 31, 2014:SharesWeighted-AverageGrant-DateFair ValueNon-vested at December 31, 2013651,781$36.36Granted126,10249.62Vested(84,235)35.09Forfeited(15,466)36.59Non-vested at March 31, 2014678,18238.98As of/Three Months Ended March 31,20142013(in thousands, except per share data)Total intrinsic value of time-based awards vested$4,317$2,303Total intrinsic value of time-based awards non-vested42,22434,572Market price per common share as of March 31,62.2649.57Weighted-average grant date fair value per share49.6236.82                                                                                                                                                                                                                                                                                                     
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|Non-vested at December 31, 2013                                                                                          | 651,781                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Granted                                                                                                                  | 126,102                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Vested                                                                                                                   | (84,235                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Forfeited                                                                                                                | (15,466                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Non-vested at March 31, 2014                                                                                             | 678,182                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|                                                                                                                         | As of/Three Months Ended March 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                                                                                                                         | 2014                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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|Total intrinsic value of time-based awards vested                                                                        | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Total intrinsic value of time-based awards non-vested                                                                    | 42,224                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Market price per common share as of March 31,                                                                            | 62.26                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Weighted-average grant date fair value per share                                                                         | 49.62                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Restricted Stock Awards, Market-Based, Valuation assumptions                                                             | In January 2014, the Compensation Committee awarded a total of42,151market-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, 2016 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:Three Months Ended March 31,20142013Expected term of award3 years3 yearsRisk-free interest rate0.8%0.4%Expected volatility55.2%56.6%Weighted-average grant date fair value per share$56.87$49.04
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|Expected term of award                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Risk-free interest rate                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Expected volatility                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|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 duringthreemonths endedMarch 31, 2014:SharesWeighted-AverageGrant-DateFair Value per ShareNon-vested at December 31, 201372,111$43.75Granted42,15156.87Non-vested at March 31, 2014114,26248.59As of/Three Months Ended March 31,20142013(in thousands, except per share data)Total intrinsic value of market-based awards vested$—$—Total intrinsic value of market-based awards non-vested7,1144,078Market price per common share as of March 31,62.2649.57Weighted-average grant date fair value per share56.8749.04                                                                                                                                                                                                                                                                                                                                            
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|Non-vested at December 31, 2013                                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Granted                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Non-vested at March 31, 2014                                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
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|                                                                                                                         | As of/Three Months Ended March 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
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|Total intrinsic value of market-based awards vested                                                                      | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Total intrinsic value of market-based awards non-vested                                                                  | 7,114                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Market price per common share as of March 31,                                                                            | 62.26                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Weighted-average grant date fair value per share                                                                         | 56.87                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

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