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Stock-Based Compensation (Schedule of Stock-based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 23,587 $ 29,253 $ 27,260
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 25,154 24,933 22,920
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ (1,567) $ 4,320 $ 4,340