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Stockholders' Equity (Schedule of Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | $ 14,065 | $ 20,036 | $ 15,420
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | 0 | 0 | 444
Deferred and Restricted Stock Unit |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | 12,427 | 10,696 | 7,830
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | 590 | 1,191 | 1,770
Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | $ 1,048 | $ 8,149 | $ 5,376

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