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Equity Compensation, Employment Agreements and Other Benefit Plans (Expense Allocation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense related to equity-based compensation instruments $ 6,723 $ 9,239 $ 8,007
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense related to equity-based compensation instruments 6,592 6,012 4,974
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense related to equity-based compensation instruments $ 131 $ 3,227 $ 3,033