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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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stock Option Awards
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value per share $ 0.00 $ 0.00 $ 6.43 $ 11.68
Total fair value of awards granted $ 0 $ 0 $ 4,104 $ 4,513
Total fair value of awards vested 38 75 6,023 8,037
Total intrinsic value of options exercised 3,278 2,016 5,637 15,169
Restricted Stock Unit Awards
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value per share $ 19.84 $ 27.43 $ 17.23 $ 34.41
Total fair value of awards granted 121 169 30,643 21,692
Total fair value of awards vested 174 165 12,276 19,098
Employee Stock Purchase Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value per share $ 0.00 $ 0.00 $ 5.02 $ 7.36
Total fair value of shares estimated to be issued $ 0 $ 0 $ 1,106 $ 1,051