Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Schedule of Grants (Details)

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Stock-Based Compensation - Schedule of Grants (Details) - shares
Sep. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding (in shares) 264,246 264,246
RSUs Outstanding (in shares) 1,643,949  
Options and RSUs Exercised (in shares) 4,372,668  
Available Shares (in shares) 1,664,988  
Total (in shares) 7,945,851  
2017 ECP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding (in shares) 0  
RSUs Outstanding (in shares) 733,500  
Options and RSUs Exercised (in shares) 41,664  
Available Shares (in shares) 1,374,836  
Total (in shares) 2,150,000  
2010 ECP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding (in shares) 250,498  
RSUs Outstanding (in shares) 910,449  
Options and RSUs Exercised (in shares) 3,380,919  
Available Shares (in shares) 290,152  
Total (in shares) 4,832,018  
2005 LTIP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding (in shares) [1] 13,748  
RSUs Outstanding (in shares) [1] 0  
Options and RSUs Exercised (in shares) [1] 950,085  
Available Shares (in shares) [1] 0  
Total (in shares) [1] 963,833  
[1] Expired June 2015