Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal amount	$ 2,482,931	$ 2,610,246
Less: unamortized costs, net	44,074	45,853
Total debt	2,438,857	2,564,393
Less: current portion long-term debt	19,972	216,032
Long-term debt	$ 2,418,885	2,348,361
Notes due \| Notes due October 2021
Debt Instrument [Line Items]
Interest rate	4.875%
Principal amount	$ 0	152,588
Notes due \| Notes due May 2022
Debt Instrument [Line Items]
Interest rate	5.375%
Principal amount	$ 72,873	148,792
Notes due \| Notes due April 2023
Debt Instrument [Line Items]
Interest rate	5.95%
Principal amount	$ 96,667	271,000
Notes due \| Notes due March 2024
Debt Instrument [Line Items]
Interest rate	4.625%
Principal amount	$ 267,952	374,000
Notes due \| Notes due March 2027
Debt Instrument [Line Items]
Interest rate	6.875%
Principal amount	$ 400,000	0
Notes due \| Notes due March 2029
Debt Instrument [Line Items]
Interest rate	7.25%
Principal amount	$ 350,000	0
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 March 2026
Debt Instrument [Line Items]
Interest rate	1.90%
Principal amount	$ 380,000	380,000
Notes due \| Term loan due March 2026 \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Notes due \| Term loan due January 2025
Debt Instrument [Line Items]
Principal amount	$ 0	818,125
Notes due \| Term loan due January 2025 \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	5.50%
Notes due \| Term loan due March 2028
Debt Instrument [Line Items]
Interest rate	4.10%
Principal amount	$ 450,000	0
Notes due \| Term loan due March 2028 \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	4.00%
Other debt
Debt Instrument [Line Items]
Principal amount	$ 4,598	$ 4,900

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

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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.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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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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