Long-Term Debt and Other Borrowing Arrangements - Carrying Values of Long-Term Debt and Other Borrowing Arrangements (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Sep. 30, 2017	Jul. 31, 2017	Oct. 31, 2016
Debt Instrument [Line Items]
Total senior subordinated notes	$ 1,459,380	$ 1,485,900
Less unamortized debt issuance costs	(19,896)	(22,700)
Long-term debt	1,439,484	1,463,200
Revolving credit agreement due 2022
Debt Instrument [Line Items]
Revolving credit agreement due 2022	$ 0	0
3.875% Senior subordinated notes due 2028
Debt Instrument [Line Items]
Senior subordinated notes interest rate	3.875%
Total senior subordinated notes	$ 392,910	400,050
3.375% Senior subordinated notes due 2027
Debt Instrument [Line Items]
Senior subordinated notes interest rate	3.375%
Total senior subordinated notes	$ 505,170	514,350
4.125% Senior subordinated notes due 2026
Debt Instrument [Line Items]
Senior subordinated notes interest rate	4.125%					4.125%
Total senior subordinated notes	$ 224,520	228,600
2.875% Senior subordinated notes due 2025
Debt Instrument [Line Items]
Senior subordinated notes interest rate	2.875%
Total senior subordinated notes	$ 336,780	$ 342,900
Senior Subordinated Notes | 3.875% Senior subordinated notes due 2028
Debt Instrument [Line Items]
Senior subordinated notes interest rate			3.875%
Senior Subordinated Notes | 3.375% Senior subordinated notes due 2027
Debt Instrument [Line Items]
Senior subordinated notes interest rate					3.375%
Senior Subordinated Notes | 2.875% Senior subordinated notes due 2025
Debt Instrument [Line Items]
Senior subordinated notes interest rate				2.875%