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Stock-Based Compensation - Summary of Stock Options Outstanding (Details)
shares in Thousands
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
Number of Shares  
December 31, 2017 (in shares) | shares 2,374
Granted (in shares) | shares 169
Exercised (in shares) | shares (177)
Forfeited (in shares) | shares (16)
Expired (in shares) | shares 0
March 31, 2018 (in shares) | shares 2,350
Weighted Average Exercise Price  
December 31, 2017 (in dollars per share) | $ / shares $ 29.22
Granted (in dollars per share) | $ / shares 52.06
Exercised (in dollars per share) | $ / shares 28.19
Forfeited (in dollars per share) | $ / shares 35.51
Expired (in dollars per share) | $ / shares 0.00
March 31, 2018 (in dollars per share) | $ / shares $ 30.90