Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal amount	$ 2,767,724	$ 2,765,949
Less: unamortized costs, net	50,977	26,227
Total debt	2,716,747	2,739,722
Less: current portion long-term debt	163,257	20,108
Long-term debt	$ 2,553,490	2,719,614
Notes due \| Notes due October 2021
Debt Instrument [Line Items]
Interest rate	4.625%
Principal amount	$ 172,456	600,000
Notes due \| Notes due May 2022
Debt Instrument [Line Items]
Interest rate	5.375%
Principal amount	$ 150,000	400,000
Notes due \| Notes due April 2023
Debt Instrument [Line Items]
Interest rate	5.70%
Principal amount	$ 275,000	400,000
Notes due \| Notes due March 2024
Debt Instrument [Line Items]
Interest rate	4.625%
Principal amount	$ 375,000	500,000
Notes due \| Notes due January 2037
Debt Instrument [Line Items]
Interest rate	5.25%
Principal amount	$ 35,841	35,841
Notes due \| Notes due March 2043
Debt Instrument [Line Items]
Interest rate	6.70%
Principal amount	$ 425,000	425,000
Notes due \| Term loan due November 2024
Debt Instrument [Line Items]
Principal amount	390,000	400,000
Notes due \| Term loan due January 2025
Debt Instrument [Line Items]
Principal amount	839,375	0
Line of credit \| Credit Facility
Debt Instrument [Line Items]
Principal amount	100,000	0
Other debt
Debt Instrument [Line Items]
Principal amount	$ 5,052	$ 5,108

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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