Debt (Long-term Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal amount	$ 2,610,246	$ 2,765,949
Less: unamortized costs, net	45,853	26,227
Total debt	2,564,393	2,739,722
Less: current portion long-term debt	216,032	20,108
Long-term debt	$ 2,348,361	2,719,614
Notes due \| Notes due October 2021
Debt Instrument [Line Items]
Interest rate	4.875%
Principal amount	$ 152,588	600,000
Notes due \| Notes due May 2022
Debt Instrument [Line Items]
Interest rate	5.375%
Principal amount	$ 148,792	400,000
Notes due \| Notes due April 2023
Debt Instrument [Line Items]
Interest rate	5.95%
Principal amount	$ 271,000	400,000
Notes due \| Notes due March 2024
Debt Instrument [Line Items]
Interest rate	4.625%
Principal amount	$ 374,000	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
Term Loan \| Term loan due November 2024
Debt Instrument [Line Items]
Principal amount	$ 380,000	400,000
Term Loan \| Term loan due November 2024 \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Term Loan \| Term loan due January 2025
Debt Instrument [Line Items]
Principal amount	$ 818,125	0
Term Loan \| Term loan due January 2025 \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	5.50%
Other debt
Debt Instrument [Line Items]
Principal amount	$ 4,900	$ 5,108

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

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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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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