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Share-based Compensation Allocation of Period Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: $ 4,174 $ 429 $ 1,979
Income tax benefits: (830) (150) (693)
Net compensation expense 3,344 279 1,286
Tax benefit realized from stock options exercised during the year 0 5,126 4,141
Stock options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 136 149 153
Income tax benefits: (48) (52) (54)
Nonvested “restricted” stock      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 4,038 280 1,826
Income tax benefits: $ (782) $ (98) $ (639)