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Share-based Compensation Allocation of Period Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: $ 3,069 $ 4,174 $ 429
Income tax benefits: (1,075) (830) (150)
Net compensation expense 1,994 3,344 279
Tax benefit realized from stock options exercised during the year 0 0 5,126
Stock options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 110 136 149
Income tax benefits: (39) (48) (52)
Nonvested “restricted” stock      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total compensation cost not yet recognized, nonvested common stock awards 4,900    
Gross compensation costs: 2,959 4,038 280
Income tax benefits: $ (1,036) $ (782) $ (98)