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Stock-Based Compensation (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stock-based employee compensation expense        
Stock-based compensation expense $ 391 $ 371 $ 1,189 $ 1,017
Tax (151) (144) (460) (394)
Stock-based compensation expense, net of tax $ 240 $ 227 $ 729 $ 623