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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: $ 5,786 $ 3,069 $ 4,174
Income tax benefits: (1,414) (1,075) (830)
Net compensation expense 4,372 1,994 3,344
Stock options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 74 110 136
Income tax benefits: (94) (39) (48)
Nonvested “restricted” stock      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 5,712 2,959 4,038
Income tax benefits: $ (1,320) $ (1,036) $ (782)