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Employee Stock Plans - Stock Option Activity Table (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Shares outstanding 1,813,198 1,860,693
Shares outstanding, weighted-average exercise price $ 46.29 $ 40.67
Shares granted 402,612  
Shares granted, weighted-average exercise price $ 62.14  
Shares exercised (408,559)  
Shares exercised, weighted-average exercise price $ 36.47  
Shares forfeited (41,548)  
Shares forfeited, weighted-average exercise price $ 44.63  
Shares exercisable 869,317  
Shares exercisable, weighted-average exercise price $ 37.64  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 57 months  
Shares outstanding, weighted-average remaining contractual life 78 months  
Shares outstanding, aggregate intrinsic value $ 18,435  
Shares exercisable, aggregate intrinsic value $ 14,598