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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, 2018
USD ($)
$ / shares
shares
Outstanding:  
Aggregate intrinsic value $ 29,557
Weighted average remaining contractual life 6 years 3 months
Exercisable:  
Number of options (in shares) | shares 1,199
Weighted average exercise price (in dollars per share) | $ / shares $ 24.76
Aggregate intrinsic value $ 22,103
Weighted average remaining contractual life 4 years 11 months