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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: $ 8,680 $ 5,786 $ 3,069
Income tax benefits: (416) (1,414) (1,075)
Net compensation expense 8,264 4,372 1,994
Stock options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 43 74 110
Income tax benefits: (114) (94) (39)
Nonvested “restricted” stock      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 8,637 5,712 2,959
Income tax benefits: $ (302) $ (1,320) $ (1,036)