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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, 2018
USD ($)
$ / shares
shares
Outstanding:  
Aggregate intrinsic value $ 22,856
Weighted average remaining contractual life 6 years 1 month
Exercisable:  
Number of options (in shares) | shares 1,141
Weighted average exercise price (in dollars per share) | $ / shares $ 24.98
Aggregate intrinsic value $ 17,837
Weighted average remaining contractual life 4 years 8 months