Condensed Consolidating Financial Information (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Long-term debt	$ 3,131,250	$ 3,152,584
Parent percentage of ownership in guarantor subsidiaries	100.00%
4.75% Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Debt, interest rate	4.75%
5.00% Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Debt, interest rate	5.00%
4.75% Senior Notes Due 2025 [Member]
Condensed Financial Statements, Captions [Line Items]
Debt, interest rate	4.75%
Senior Notes [Member] | 4.75% Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term debt	$ 600,000	600,000
Senior Notes [Member] | 5.00% Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term debt	1,000,000	1,000,000
Senior Notes [Member] | 4.75% Senior Notes Due 2025 [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term debt	$ 800,000	$ 800,000