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Share-Based Compensation - Summary of Stock Options Outstanding (Details)
shares in Thousands
 3 Months Ended
Mar. 31, 2017
$ / shares
shares
Number of Shares  
December 31, 2016 (in shares) | shares 2,615
Granted (in shares) | shares 544
Cancelled (in shares) | shares (39)
Exercised (in shares) | shares (201)
March 31, 2017 (in shares) | shares 2,919
Weighted Average Exercise Price  
December 31, 2016 (in dollars per share) | $ / shares $ 24.61
Granted (in dollars per share) | $ / shares 39.38
Cancelled (in dollars per share) | $ / shares 33.82
Exercised (in dollars per share) | $ / shares 23.31
March 31, 2017 (in dollars per share) | $ / shares $ 27.33