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Share-based Compensation Allocation of Period Costs (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: $ 553 $ 1,300 $ 742
Income tax benefits: (193) (262) (256)
Net compensation expense 360 1,038 486
Tax benefit realized from stock options exercised during the year 7,805 5,841 2,088
Stock options
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 158 134 112
Income tax benefits: (55) (45) (39)
Nonvested stock
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 395 1,166 630
Income tax benefits: $ (138) $ (217) $ (217)