Stock-Based Compensation - Schedule of Grants (Details)	Sep. 30, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding (in shares)	264,246
RSUs Outstanding (in shares)	1,171,761
Options and RSUs Exercised (in shares)	3,730,825
Available Shares (in shares)	2,379,019
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)	1,046,761
Options and RSUs Exercised (in shares)	2,780,740
Available Shares (in shares)	504,019
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