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Share-Based Compensation - Summarized Information About Stock Awards (Details) - $10.39 to $34.14
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Stock Options  
Exercise price range - lower limit (in dollars per share) | $ / shares $ 10.39
Exercise price range - upper limit (in dollars per share) | $ / shares $ 34.14
Outstanding:  
Weighted average remaining contractual life (years) 7 years
Aggregate intrinsic value $ 35,492
Exercisable:  
Number of shares (in shares) | shares 1,346
Weighted average remaining contractual life (years) 5 years 2 months 12 days
Aggregate intrinsic value $ 24,454
Exercised:  
Aggregate intrinsic value of stock options exercised $ 1,737