Debt (Summary Of Company's Senior Notes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Debt Instrument
Senior note carrying value	$ 1,818,561us-gaap_SeniorNotes	$ 2,058,168us-gaap_SeniorNotes
Estimated fair value	1,952,774us-gaap_DebtInstrumentFairValue	2,070,744us-gaap_DebtInstrumentFairValue
Unsecured Senior Notes 5.20% Due February 2015 [Member]
Debt Instrument
Senior note carrying value	0	95,633
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
Senior note carrying value	236,452	233,085
Debt instrument, interest rate, stated percentage	5.25%	5.25%
Debt instrument, maturity date, description	June 2015	June 2015
Unsecured Senior Notes 6.50% Due May 2016 [Member]
Debt Instrument
Senior note carrying value	462,009	459,581
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	122,752	122,663
Debt instrument, interest rate, stated percentage	7.625%	7.625%
Debt instrument, maturity date, description	October 2017	October 2017
Unsecured Senior Notes 7.875% Due June 2032 [Member]
Debt Instrument
Senior note carrying value	299,239	299,196
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	398,640	398,567
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	299,469	299,443
Debt instrument, interest rate, stated percentage	6.00%	6.00%
Debt instrument, maturity date, description	February 2035	February 2035
Unsecured Senior Notes 7.375% Due June 2046 [Member]
Debt Instrument
Senior note carrying value	$ 0	$ 150,000
Debt instrument, interest rate, stated percentage	7.375%	7.375%
Debt instrument, maturity date, description	June 2046	June 2046

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

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Section 03

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