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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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