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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) $ / shares item shares
Granted After November 13, 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 3 years
Granted After November 13, 2015 [Member] | First Year [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting rights, percentage | 33.33%
Granted Before November 13, 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 3 years
Restricted Stock Awards And Restricted Stock Unit Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock compensation expense | $ 40,306
Stock Options And Restricted Stock Awards [Member] | 2015 Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of market conditions for stock award vesting | item | 2
Trading price for stock award tranche one | $ / shares | $ 30.00
Trading price for stock award tranche two | $ / shares | $ 40.00
Stock award tranche granting period | 90 days
Restricted Stock Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock compensation expense | $ 5,517
Restricted Stock Awards [Member] | 2015 Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares awarded | shares | 469
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of stock options exercised | shares |
Stock compensation expense | $ 14,956
Weighted Average [Member] | Restricted Stock Awards And Restricted Stock Unit Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 2 years
Weighted Average [Member] | Restricted Stock Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 3 years
Weighted Average [Member] | Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 3 years

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