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Long-term Debt (Summary of Long-Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Feb. 26, 2021	Feb. 08, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 2,875,000			$ 2,875,000
Unamortized discount	(26,379)			(18,337)
Unamortized deferred financing costs	(15,079)			(7,356)
Long-term debt, net	2,833,542			2,849,307
Current portion of long-term debt	8,438			75,000
Noncurrent portion of long-term debt	$ 2,825,104			2,774,307
5.00% Notes due April 2024
Debt Instrument [Line Items]
Interest rate	5.00%
4.75% Notes due August 2025
Debt Instrument [Line Items]
Interest rate	4.75%
4.25% Notes due February 2029
Debt Instrument [Line Items]
Interest rate	4.25%
Senior Notes \| 4.75% Notes due December 2022
Debt Instrument [Line Items]
Long-term debt	$ 0			400,000
Interest rate		4.75%
Senior Notes \| 5.00% Notes due April 2024
Debt Instrument [Line Items]
Long-term debt	$ 400,000			1,000,000
Interest rate	5.00%	5.00%
Senior Notes \| 4.75% Notes due August 2025
Debt Instrument [Line Items]
Long-term debt	$ 800,000			800,000
Senior Notes \| 4.25% Notes due February 2029
Debt Instrument [Line Items]
Long-term debt	1,000,000			0
Interest rate			4.25%
Secured debt \| Term Loan A Facility
Debt Instrument [Line Items]
Long-term debt	675,000			$ 675,000
Revolving credit facility
Debt Instrument [Line Items]
Remaining undrawn capacity	$ 500,000