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Stock-Based Compensation - Summarized Information About Stock Awards (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Outstanding:  
Aggregate intrinsic value $ 65,589
Weighted average remaining contractual life (years) 6 years 6 months
Exercisable:  
Number of shares (in shares) | shares 1,123
Weighted average exercise price (in dollars per share) | $ / shares $ 21.05
Aggregate intrinsic value $ 36,950
Weighted average remaining contractual life (years) 4 years 6 months