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Debt (Tables) | 3 Months Ended
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Mar. 31, 2012
Debt Disclosure [Abstract] |
Schedule of Senior Notes | Our senior notes are summarized as follows ($000’s omitted):
| March 31, 2012 |  | December 31, 2011
5.45% unsecured senior notes due August 2012 (b) | $ | 96,634 |  |  | $ | 96,795 |
6.25% unsecured senior notes due February 2013 (b) | 62,692 |  |  | 62,677 |
5.125% unsecured senior notes due October 2013 (b) | 117,522 |  |  | 117,197 |
5.25% unsecured senior notes due January 2014 (b) | 255,887 |  |  | 255,882 |
5.70% unsecured senior notes due May 2014 (b) | 312,613 |  |  | 311,900 |
5.20% unsecured senior notes due February 2015 (b) | 207,916 |  |  | 207,906 |
5.25% unsecured senior notes due June 2015 (b) | 271,557 |  |  | 270,551 |
6.50% unsecured senior notes due May 2016 (b) | 469,774 |  |  | 469,147 |
7.625% unsecured senior notes due October 2017 (a) | 149,400 |  |  | 149,373 |
7.875% unsecured senior notes due June 2032 (b) | 299,119 |  |  | 299,108 |
6.375% unsecured senior notes due May 2033 (b) | 398,436 |  |  | 398,418 |
6.00% unsecured senior notes due February 2035 (b) | 299,396 |  |  | 299,390 |
7.375% unsecured senior notes due June 2046 (b) | 150,000 |  |  | 150,000 |
Total senior notes – carrying value (c) | $ | 3,090,946 |  |  | $ | 3,088,344 |
Estimated fair value | $ | 3,030,286 |  |  | $ | 2,765,151 |
(a) | Not redeemable prior to maturity; guaranteed on a senior basis by certain wholly-owned subsidiaries.
(b) | Redeemable prior to maturity, guaranteed on a senior basis by certain wholly-owned subsidiaries.
(c) | The recorded carrying value reflects the impact of various discounts and premiums that are amortized to interest cost over the respective terms of the senior notes

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 9: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 + Details
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