Share-Based Compensation - Summary of Stock Options Outstanding (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Number of Shares
December 31, 2016 (in shares) | shares	2,615
Granted (in shares) | shares	544
Canceled (in shares) | shares	(61)
Exercised (in shares) | shares	(334)
June 30, 2017 (in shares) | shares	2,764
Weighted Average Exercise Price
December 31, 2016 (in dollars per share) | $ / shares	$ 24.61
Granted (in dollars per share) | $ / shares	39.38
Canceled (in dollars per share) | $ / shares	33.96
Exercised (in dollars per share) | $ / shares	22.14
June 30, 2017 (in dollars per share) | $ / shares	$ 27.61