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Debt (Summary Of Company's Senior Notes) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument |  |
Senior note carrying value | $ 2,058,168 | $ 2,509,613
Estimated fair value | 2,070,744 | 2,663,451
Unsecured Senior Notes 5.25% Due January 2014 [Member] |  |
Debt Instrument |  |
Senior note carrying value | 0 | 187,970
Debt instrument, interest rate, stated percentage | 5.25% | 5.25%
Debt instrument, maturity date, description | January 2014 | January 2014
Unsecured Senior Notes 5.70% Due May 2014 [Member] |  |
Debt Instrument |  |
Senior note carrying value | 0 | 208,274
Debt instrument, interest rate, stated percentage | 5.70% | 5.70%
Debt instrument, maturity date, description | May 2014 | May 2014
Unsecured Senior Notes 5.20% Due February 2015 [Member] |  |
Debt Instrument |  |
Senior note carrying value | 95,633 | 95,615
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 | 233,085 | 264,058
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 | 459,581 | 457,154
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 | 122,663 | 149,481
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 | 299,196 | 299,152
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 | 398,567 | 398,492
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 | 299,443 | 299,417
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 | $ 150,000 | $ 150,000
Debt instrument, interest rate, stated percentage | 7.375% | 7.375%
Debt instrument, maturity date, description | June 2046 | June 2046

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References 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=28364263&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 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 + Details
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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 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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