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)
Mar. 31, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) 264,246
RSUs Outstanding (in shares) 930,420
Options and RSUs Exercised (in shares) 3,909,443
Available Shares (in shares) 2,441,742
Total (in shares) 7,545,851
2017 ECP  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) 0
RSUs Outstanding (in shares) 125,000
Options and RSUs Exercised (in shares) 0
Available Shares (in shares) 1,875,000
Total (in shares) 2,000,000
2010 ECP  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) 250,498
RSUs Outstanding (in shares) 805,420
Options and RSUs Exercised (in shares) 2,959,358
Available Shares (in shares) 566,742
Total (in shares) 4,582,018
2005 LTIP  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) 13,748 [1]
RSUs Outstanding (in shares) 0 [1]
Options and RSUs Exercised (in shares) 950,085 [1]
Available Shares (in shares) 0 [1]
Total (in shares) 963,833 [1]
[1] Expired June 2015