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Stock-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Aggregate intrinsic value of stock option exercised | $ 0 |
Granted Before 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] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
Award vesting rights, percentage | 33.33% |
Restricted Stock Awards And Restricted Stock Unit Awards [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock compensation expense | $ 33,202 |
Stock Options And Restricted Stock Awards [Member] | 2015 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading price for stock award tranche one | $ 30.00 |
Trading price for stock award tranche two | $ 40.00 |
Stock award tranche granting period | 90 days |
Restricted Stock Awards [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded | 393 | 393
Stock compensation expense | $ 2,931 |
Stock Options [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of stock options exercised |  |
Stock compensation expense | $ 7,424 |
Weighted Average [Member] | Restricted Stock Awards [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 1 year 9 months 18 days |
Weighted Average [Member] | Stock Options [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 1 year 8 months 12 days |

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