Debt (Components of Long-term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total face value	$ 3,500,000	$ 1,750,000
Less: unamortized discount	(7,000)	(5,594)
Less: unamortized issuance costs	(20,221)	(11,784)
Total long-term debt	3,472,779	1,732,622
2026 Notes [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total face value	750,000	0
Total long-term debt	741,596
2027 Notes [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total face value	750,000	750,000
Total long-term debt	744,039
2030 Notes [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total face value	750,000	750,000
Total long-term debt	739,401
2021 Term Loan Credit Agreement [Member]
Debt Instrument [Line Items]
Total face value	1,000,000	0
2020 Credit Agreement [Member] | 3-year Term Loan Facility [Member]
Debt Instrument [Line Items]
Total face value	$ 250,000	$ 250,000