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Stock-Based Compensation (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock-based employee compensation expense      
Stock-based compensation expense $ 1,530 $ 1,375 $ 1,218
Tax 592 532 471
Stock-based compensation expense, net of tax $ 938 $ 843 $ 747