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Stock-based Compensation Stock-based Compensation (Details 4) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock Option Awards
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total fair value of awards vested $ 11 $ 13
Total intrinsic value of options exercised 8,916 1,187
Restricted Stock Unit Awards
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average grant date fair value per share $ 30.27 $ 17.30
Total fair value of awards granted 170 142
Total fair value of awards vested $ 3,608 $ 184