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Equity Compensation Plans and Share-Based Compensation - Share-based Compensation Allocation of Period Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: $ 2,914 $ 8,680 $ 5,786
Income tax benefits: (995) (416) (1,414)
Net compensation expense 1,919 8,264 4,372
Stock options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 15 43 74
Income tax benefits: (94) (114) (94)
Nonvested “restricted” stock      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 2,899 8,637 5,712
Income tax benefits: $ (901) $ (302) $ (1,320)