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Stockholders' Equity (Schedule of Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | $ 16,077 | $ 14,065 | $ 20,036
Deferred and Restricted Stock Unit |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | 14,342 | 12,427 | 10,696
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | 0 | 590 | 1,191
Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | $ 1,735 | $ 1,048 | $ 8,149

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