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Share Based Compensation (Details 5) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of additional information pertaining to stock options      
Total intrinsic value of stock options outstanding $ 2,329   $ 2,341
Total intrinsic value of stock options exercised 296 325 544
Fair value of stock options vested 539 682 404
Cash received from the exercise of stock options 248 296 593
Tax deficiencies from share-based compensation $ 96 $ (325) $ (524)