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Share-Based Compensation - Summary of Stock Options Activity (Details) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Weighted Average Exercise Price      
Beginning of period (in dollars per share) $ 19.45 $ 16.05 $ 13.18
Granted (in dollars per share) 30.30 28.02 23.50
Cancelled (in dollars per share) 26.59 21.95 18.18
Exercised (in dollars per share) 16.46 11.66 10.37
End of period (in dollars per share) $ 22.16 $ 19.45 $ 16.05
Number of Shares      
Beginning of period (in shares) 2,362 2,483 2,632
Granted (in shares) 561 535 564
Cancelled (in shares) (80) (122) (88)
Exercised (in shares) (382) (534) (625)
End of period (in shares) 2,461 2,362 2,483