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Nature of Business and Significant Accounting Policies (Details 6) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Option Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share $ 6.43 $ 11.61 $ 11.52
Total fair value of awards granted $ 4,104 $ 4,613 $ 7,299
Total fair value of awards vested 6,023 8,492 7,281
Total intrinsic value of options exercised 5,928 21,234 33,920
Restricted Stock Unit Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share $ 17.23 $ 34.35 $ 29.91
Total fair value of awards granted 30,660 21,822 16,011
Employee Stock Purchase Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share $ 4.66 $ 6.99 $ 6.59
Total fair value of shares estimated to be issued $ 1,694 $ 2,359 $ 1,885