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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stock Option Awards
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value per share $ 7.65 $ 0.00 $ 5.92 $ 6.43
Total fair value of awards granted $ 278 $ 0 $ 6,095 $ 4,104
Total fair value of awards vested 33 38 5,059 6,023
Total intrinsic value of options exercised 1,910 3,278 3,748 5,637
Restricted Stock Unit Awards
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value per share $ 31.30 $ 19.84 $ 23.91 $ 17.23
Total fair value of awards granted 2,427 121 28,063 30,643
Total fair value of awards vested 222 174 13,541 12,276
Employee Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value per share $ 0.00 $ 0.00 $ 5.25 $ 5.02
Sharebased Compensation Arrangement by Sharebased Payment Award Equity Instruments other than Options Shares Estimated to be Issued Total Fair Value1 $ 0 $ 0 $ 552 $ 1,106