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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Market-based restricted stock unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of awards granted $ 3,300    
Stock Option Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share $ 5.60 $ 7.41 $ 5.92
Total fair value of awards granted $ 4,170 $ 4,947 $ 6,095
Total fair value of awards vested 4,290 4,662 5,059
Total intrinsic value of options exercised $ 15,585 $ 35,663 $ 4,642
Restricted Stock Unit Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share $ 29.12 $ 32.80 $ 23.94
Total fair value of awards granted $ 27,200 $ 22,484 $ 28,239
Total fair value of awards vested $ 24,458 $ 30,277 $ 13,846
Market-based restricted stock unit [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share $ 25.55    
Restricted stock units granted 128    
Employee Stock Purchase Plan (ESPP)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share $ 5.83 $ 7.38 $ 5.94
Total fair value of shares estimated to be issued $ 951 $ 1,144 $ 1,169