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Nature of Business and Significant Accounting Policies (Details 6) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Market-based restricted stock unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of awards granted $ 1,500    
Performance-based restricted stock unit [Domain]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of awards granted 1,600    
Stock Option Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of awards granted 4,716 $ 4,170 $ 4,947
Total fair value of awards vested 4,407 4,290 4,662
Total intrinsic value of options exercised $ 6,170 $ 15,585 $ 35,663
Weighted average grant date fair value per share $ 5.68 $ 5.60 $ 7.41
Restricted Stock Unit Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share $ 28.86 $ 29.12 $ 32.80
Total fair value of awards granted $ 28,603 $ 27,150 $ 22,484
Total fair value of awards vested $ 21,130 $ 24,458 $ 30,277
Market-based restricted stock unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted 64 128  
Weighted average grant date fair value per share $ 22.89 $ 25.55  
Performance-based restricted stock unit [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted 62    
Weighted average grant date fair value per share $ 26.41    
Employee Stock Purchase Plan (ESPP)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share $ 6.33 $ 5.83 $ 7.38
Total fair value of shares estimated to be issued $ 923 $ 951 $ 1,144