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Stock-Based Compensation - Summarized Information About Stock Awards (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Outstanding:  
Aggregate intrinsic value $ 9,137
Weighted average remaining contractual life 6 years
Exercisable:  
Number of options (in shares) | shares 1,364
Weighted average exercise price (in dollars per share) | $ / shares $ 27.84
Aggregate intrinsic value $ 8,912
Weighted average remaining contractual life 4 years 9 months 18 days