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Long-term Compensation Plans - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares of common stock that may be subject to grant awards (in shares)       15,500,000
Awards outstanding (in shares) 3,675,726 3,003,003    
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1.4      
Awards granted (in shares) 1,117,719 1,754,868 453,260  
The 2013 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares) 496,203      
Awards outstanding (in shares) 3,500,726