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Stock Based Compensation (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of compensation expense and stock award activity      
Stock-based compensation expense $ 8,319 $ 7,410 $ 5,358
Cash received by Company from exercises $ 4,267 $ 2,613 $ 2,062