Share-Based Compensation - Summary of Stock Options Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Number of Shares
Beginning of period (in shares) | shares	2,461
Granted (in shares) | shares	569
Exercised (in shares) | shares	(294)
Forfeited (in shares) | shares	(116)
Expired (in shares) | shares	(5)
End of period (in shares) | shares	2,615
Weighted Average Exercise Price
Beginning of period (in dollars per share) | $ / shares	$ 22.16
Granted (in dollars per share) | $ / shares	34.14
Exercised (in dollars per share) | $ / shares	20.46
Forfeited (in dollars per share) | $ / shares	29.80
Expired (in dollars per share) | $ / shares	23.82
End of period (in dollars per share) | $ / shares	$ 24.61