Debt (Summary Of Company's Senior Notes) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Jul. 29, 2016
Debt Instrument
Senior note carrying value	$ 2,711,659	$ 2,986,753
Debt Issuance Costs, Net	(14,295)	(13,247)
Other Notes Payable	53,381	41,313
Notes payable	2,765,040	3,028,066
Notes Payable, Fair Value Disclosure	3,152,046	2,899,143
5.500% unsecured senior notes due March 2026 [Member] \| Senior Notes [Member]
Debt Instrument
Senior note carrying value	700,000	700,000
Senior Unsecured Term Loan Maturing January 3, 2027 [Member] [Domain] \| Senior Notes [Member]
Debt Instrument
Senior note carrying value	$ 600,000	$ 600,000
Debt instrument, interest rate, stated percentage		5.00%	5.00%
5.500% unsecured senior notes due March 2026 [Member]
Debt Instrument
Debt instrument, maturity date, description	March 2026	March 2026
Senior Notes [Member] \| 5.500% unsecured senior notes due March 2026 [Member]
Debt Instrument
Debt instrument, interest rate, stated percentage		5.50%	5.50%
Senior Notes [Member] \| 4.250% unsecured senior notes due March 2021 [Member]
Debt Instrument
Debt instrument, interest rate, stated percentage		4.25%	4.25%
4.250% unsecured senior notes due March 2021 [Member]
Debt Instrument
Senior note carrying value	$ 425,954	$ 700,000
Debt instrument, maturity date, description	March 2021	March 2021
Unsecured Senior Notes 7.875% Due June 2032 [Member]
Debt Instrument
Senior note carrying value	$ 300,000	$ 300,000
Debt instrument, interest rate, stated percentage	7.875%	7.875%
Debt instrument, maturity date, description	June 2032	June 2032
Senior Unsecured Term Loan Maturing January 3, 2027 [Member] [Domain]
Debt Instrument
Debt instrument, maturity date, description	January 2027	January 2027
Unsecured Senior Notes 6.375% Due May 2033 [Member]
Debt Instrument
Senior note carrying value	$ 400,000	$ 400,000
Debt instrument, interest rate, stated percentage	6.375%	6.375%
Debt instrument, maturity date, description	May 2033	May 2033
Unsecured Senior Notes 6.00% Due February 2035 [Member]
Debt Instrument
Senior note carrying value	$ 300,000	$ 300,000
Debt instrument, interest rate, stated percentage	6.00%	6.00%
Debt instrument, maturity date, description	February 2035	February 2035

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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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Fair value portion of notes payable.

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Amount of long-term notes payable classified as other.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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