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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, 2018
USD ($)
$ / shares
shares
Outstanding:  
Aggregate intrinsic value $ 31,016
Weighted average remaining contractual life 6 years 5 months 31 days
Exercisable:  
Number of shares (in shares) | shares 1,231
Weighted average exercise price (in dollars per share) | $ / shares $ 24.76
Aggregate intrinsic value $ 23,043
Weighted average remaining contractual life 5 years 1 month