|**Common Stock (Tables)**                                                                                                | 9 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 September 30,Nine Months Ended September 30,2018201720182017(in thousands)Stock-based compensation expense$5,578$4,761$16,357$14,587Income tax benefit(1,337)(1,781)(3,921)(5,457)Net stock-based compensation expense$4,241$2,980$12,436$9,130                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Stock-based compensation expense                                                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Income tax benefit                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Net stock-based compensation expense                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity                               | The following table presents the changes in non-vested time-based RSUs to all employees, including executive officers, for theninemonths endedSeptember 30, 2018:SharesWeighted-AverageGrant DateFair Value per ShareNon-vested at December 31, 2017472,132$60.23Granted416,68750.85Vested(219,768)58.26Forfeited(36,137)57.22Non-vested at September 30, 2018632,91454.91The following table presents the weighted-average grant date fair value per share and related information as of/for the periods presented:Nine Months Ended September 30,20182017(in thousands, except per share data)Total intrinsic value of time-based awards vested$11,178$13,266Total intrinsic value of time-based awards non-vested30,98725,762Market price per share as of September 30, 201848.9649.03Weighted-average grant date fair value per share50.8566.00 
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|                                                                                                                         | Shares                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
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|Non-vested at December 31, 2017                                                                                          | 472,132                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Granted                                                                                                                  | 416,687                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Vested                                                                                                                   | (219,768                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Forfeited                                                                                                                | (36,137                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Non-vested at September 30, 2018                                                                                         | 632,914                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
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|                                                                                                                         | Nine Months Ended September 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                         | 2018                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|Total intrinsic value of time-based awards vested                                                                        | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Total intrinsic value of time-based awards non-vested                                                                    | 30,987                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Market price per share as of September 30, 2018                                                                          | 48.96                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Weighted-average grant date fair value per share                                                                         | 50.85                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Restricted Stock Awards, Market-Based, Valuation assumptions                                                             | he Compensation Committee awarded a total of90,778market-based PSUs to our executive officers during theninemonths endedSeptember 30, 2018. In addition to continuous employment, the vesting of these PSUs is contingent on our total stockholder return ("TSR"), which is essentially our stock price change including any dividends over a three-year period ending on December 31, 2020, as compared to the TSR of a group of peer companies over the same period. The PSUs will result in a payout between0 percentand200 percentof the target PSUs awarded. The weighted-average grant date fair value per PSU granted was computed using the Monte Carlo pricing model using the following assumptions:Nine Months Ended September 30,20182017Expected term of award (in years)33Risk-free interest rate2.4%1.4%Expected volatility42.3%51.4%
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|                                                                                                                         | Nine Months Ended September 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                         | 2018                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|Expected term of award (in years)                                                                                        | 3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Risk-free interest rate                                                                                                  | 2.4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Expected volatility                                                                                                      | 42.3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Schedule of Nonvested Performance-based Units Activity                                                                   | The following table presents the change in non-vested market-based awards during theninemonths endedSeptember 30, 2018:SharesWeighted-AverageGrant DateFair Value per ShareNon-vested at December 31, 201752,349$84.06Granted90,77869.98Forfeited(4,128)94.02Non-vested at September 30, 2018138,99974.57The following table presents the weighted-average grant date fair value per share and related information as of/for the periods presented:Nine Months Ended September 30,20182017(in thousands, except per share data)Total intrinsic value of market-based awards non-vested$6,805$3,750Market price per common share as of September 30,48.9649.03Weighted-average grant date fair value per share69.9894.02                                                                                                                             
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|Non-vested at December 31, 2017                                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Granted                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Forfeited                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Non-vested at September 30, 2018                                                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|                                                                                                                         | Nine Months Ended September 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                                                                         | 2018                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|Total intrinsic value of market-based awards non-vested                                                                  | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Market price per common share as of September 30,                                                                        | 48.96                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Weighted-average grant date fair value per share                                                                         | 69.98                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

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