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Share-based Compensation Allocation of Period Costs (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: $ 1,300 $ 742 $ 1,006
Income tax benefits: (262) (256) (361)
Net compensation expense 1,038 486 645
Tax benefit realized from stock options exercised during the year 5,841 2,088 6,154
Stock options
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 134 112 91
Income tax benefits: (45) (39) (33)
Nonvested stock
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Gross compensation costs: 1,166 630 915
Income tax benefits: $ (217) $ (217) $ (328)