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Share-Based Compensation - Summary of Stock Award Activity (Details)
shares in Thousands
 3 Months Ended
Mar. 31, 2016
$ / shares
shares
Number of Shares  
December 31, 2015 (in shares) | shares 2,461
Granted (in shares) | shares 569
Cancelled (in shares) | shares (13)
Exercised (in shares) | shares (124)
March 31, 2016 (in shares) | shares 2,893
Weighted Average Exercise Price  
December 31, 2015 (in dollars per share) | $ / shares $ 22.16
Granted (in dollars per share) | $ / shares 34.14
Cancelled (in dollars per share) | $ / shares 28.39
Exercised (in dollars per share) | $ / shares 20.83
March 31, 2016 (in dollars per share) | $ / shares $ 24.54