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Stock-Based Compensation - Restricted Stock Awards, Textuals (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]      
Restricted stock awards issued, net of forfeitures $ 442 $ 1,300 $ 2,200
Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 76 440 907
Tax benefit $ 17 $ 93 $ 191
PRSU      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years