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Share-Based Compensation (Details) - $ / shares
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restricted Stock Units [Member]    
Share-Based Compensation [Line Items]    
Units granted 665,000 483,387
Weighted-average per share prices $ 30.48 $ 19.14
Stock Options [Member]    
Share-Based Compensation [Line Items]    
Stock options awarded 265,000 274,000
Weighted-average exercise prices $ 23.47 $ 16.20
Performance-based Restricted Stock Units [Member]    
Share-Based Compensation [Line Items]    
Units forfeited 20,985  
Units forfeited, Weighted Average Exercise Price $ 23.91  
Performance-based Stock Options [Member]    
Share-Based Compensation [Line Items]    
Options forfeited 19,466  
Options forfeited, Weighted Average Exercise Price $ 26.56