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Share-Based Compensation - Summarized Information About Stock Awards (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Outstanding:  
Aggregate intrinsic value $ 53,140
Weighted average remaining contractual life (years) 6 years 6 months
Exercisable:  
Number of shares (in shares) | shares 1,305
Weighted average exercise price (in dollars per share) | $ / shares $ 20.51
Aggregate intrinsic value $ 34,338
Weighted average remaining contractual life (years) 4 years 6 months