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Share-based Compensation Allocation of Period Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: $ 429 $ 1,979 $ 553
Income tax benefits: (150) (693) (193)
Net compensation expense 279 1,286 360
Tax benefit realized from stock options exercised during the year 5,126 4,141 7,805
Stock options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 149 153 158
Income tax benefits: (52) (54) (55)
Nonvested stock      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 280 1,826 395
Income tax benefits: $ (98) $ (639) $ (138)