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Stock-Based Compensation - Summarized Information About Stock Awards (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Outstanding:  
Aggregate intrinsic value $ 5,846
Weighted average remaining contractual life 5 years 10 months 24 days
Exercisable:  
Number of options (in shares) | shares 1,305
Weighted average exercise price (in dollars per share) | $ / shares $ 28.09
Aggregate intrinsic value $ 5,844
Weighted average remaining contractual life 4 years 8 months 12 days