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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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Debt (Summary Of Company's Senior Notes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017	Jul. 29, 2016
Debt Instrument
Senior note carrying value	$ 2,986,943	$ 3,110,016
Debt Issuance Costs, Net	(13,057)	(12,984)
Other Notes Payable	20,024	19,282
Notes payable	3,006,967	3,129,298
Notes Payable, Fair Value Disclosure	3,263,774	3,131,579
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%
Unsecured Senior Notes 6.50% due May 2016 [Member]
Debt Instrument
Senior note carrying value		$ 465,245
Debt instrument, maturity date, description	May 2016	May 2016
Unsecured Senior Notes 7.625% Due October 2017 [Member]
Debt Instrument
Senior note carrying value	$ 0	$ 123,000
Debt instrument, maturity date, description	October 2017	October 2017
Senior Notes [Member] \| 5.500% unsecured senior notes due March 2026 [Member]
Debt Instrument
Debt instrument, interest rate, stated percentage			5.50%
Senior Notes [Member] \| 4.250% unsecured senior notes due March 2021 [Member]
Debt Instrument
Debt instrument, interest rate, stated percentage				4.25%
4.250% unsecured senior notes due March 2021 [Member]
Debt Instrument
Senior note carrying value	$ 700,000	$ 700,000
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
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