Stock-Based Compensation (Narrative) (Details) $ / shares in Units, shares in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) tranche $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of stock option exercised	$ 0
Granted Before November 13, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Granted After November 13, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Vesting percentage	33.33%
Restricted Stock - Market Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares) \| shares	369
Restricted Stock - Performance Measures
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares) \| shares	396
Restricted Stock Awards and Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 37,828,000
Restricted Stock Awards and Restricted Stock Unit Awards \| Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years
Stock Options and Restricted Stock Awards \| 2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of tranches \| tranche	2
Trading price for stock award tranche one (in usd per share) \| $ / shares	$ 30
Trading price for stock award tranche two (in usd per share) \| $ / shares	$ 40
Stock award tranche granting period	90 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 1,049,000
Restricted Stock \| Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	11 months 28 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 2,796,000
Stock Options \| Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	11 months 18 days

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