Stock-Based Compensation (Narrative) (Details)	12 Months Ended
Dec. 31, 2019 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%
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding (in shares) \| shares	0
Restricted Stock - Market Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares) \| shares	241,000
Restricted Stock - Performance Measures
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares) \| shares	370,000
Restricted Stock Awards And Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 33,334,000
Restricted Stock Awards And Restricted Stock Unit Awards \| Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year 9 months 18 days
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	$ 69,000
Restricted Stock \| Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 months 24 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 181,000
Stock Options \| Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 months 24 days

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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