Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

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Stock-Based Compensation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Summary of employee stock-based compensation expense        
Employee stock-based compensation expense $ 1,195 $ 714 $ 3,125 $ 2,359
Tax effect on employee stock-based compensation expense (482) (261) (1,256) (920)
Net effect on income $ 713 $ 453 $ 1,869 $ 1,439