Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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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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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Debt (Summary Of Company's Senior Notes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Jul. 29, 2016
Debt Instrument
Senior note carrying value	$ 3,110,016	$ 1,576,082
Debt Issuance Costs, Net	(12,984)	(12,163)
Estimated fair value	3,112,297	1,643,651
5.500% unsecured senior notes due March 2026 [Member] \| Senior Notes [Member]
Debt Instrument
Senior note carrying value	700,000	0
Senior Unsecured Term Loan Maturing January 3, 2027 [Member] [Domain] \| Senior Notes [Member]
Debt Instrument
Senior note carrying value	600,000	0
Debt instrument, interest rate, stated percentage				5.00%
Unsecured Senior Notes 6.50% due May 2016 [Member]
Debt Instrument
Senior note carrying value	$ 0	$ 465,245
Debt instrument, interest rate, stated percentage	6.50%	6.50%
Debt instrument, maturity date, description	May 2016	May 2016
Unsecured Senior Notes 7.625% Due October 2017 [Member]
Debt Instrument
Senior note carrying value	$ 123,000	$ 123,000
Debt instrument, interest rate, stated percentage	7.625%	7.625%
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	$ 0
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
Unsecured Senior Notes 5.20% Due February 2015 [Member]
Debt Instrument
Debt instrument, interest rate, stated percentage	5.20%	5.20%
Debt instrument, maturity date, description	February 2015	February 2015
Unsecured Senior Notes 5.25% Due June 2015 [Member]
Debt Instrument
Debt instrument, interest rate, stated percentage	5.25%	5.25%
Debt instrument, maturity date, description	June 2015	June 2015
Unsecured Senior Notes 7.375% Due June 2046 [Member]
Debt Instrument
Debt instrument, interest rate, stated percentage	7.375%	7.375%
Debt instrument, maturity date, description	June 2046	June 2046