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Debt (Tables) | 12 Months Ended
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Dec. 31, 2011
Debt Disclosure [Abstract] |
Schedule of Senior Notes | Our senior notes are summarized as follows ($000’s omitted):
| December 31,
| 2011 |  | 2010
8.125% unsecured senior notes due February 2011 (a) | $ | — |  |  | $ | 13,900 |
5.45% unsecured senior notes due August 2012 (b) | 96,795 |  |  | 104,823 |
6.25% unsecured senior notes due February 2013 (b) | 62,677 |  |  | 62,617 |
5.125% unsecured senior notes due October 2013 (b) | 117,197 |  |  | 160,212 |
5.25% unsecured senior notes due January 2014 (b) | 255,882 |  |  | 335,848 |
5.70% unsecured senior notes due May 2014 (b) | 311,900 |  |  | 309,048 |
5.20% unsecured senior notes due February 2015 (b) | 207,906 |  |  | 244,839 |
5.25% unsecured senior notes due June 2015 (b) | 270,551 |  |  | 397,700 |
6.50% unsecured senior notes due May 2016 (b) | 469,147 |  |  | 466,644 |
7.625% unsecured senior notes due October 2017 (a) | 149,373 |  |  | 149,265 |
7.875% unsecured senior notes due June 2032 (b) | 299,108 |  |  | 299,065 |
6.375% unsecured senior notes due May 2033 (b) | 398,418 |  |  | 398,344 |
6.00% unsecured senior notes due February 2035 (b) | 299,390 |  |  | 299,363 |
7.375% unsecured senior notes due June 2046 (b) | 150,000 |  |  | 150,000 |
Total senior notes – carrying value (c) | $ | 3,088,344 |  |  | $ | 3,391,668 |
Estimated fair value | $ | 2,765,151 |  |  | $ | 3,227,404 |
(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
Schedule of Extinguishment of Debt | During the last three years, we reduced our outstanding senior notes through a variety of transactions ($000’s omitted):
Retirement Date | Series | Transaction Type | Principal Retired
November / December 2011 | 5.25% unsecured senior notes due January 2014 | Open market repurchases | $ | 80,000 |
| 5.20% unsecured senior notes due February 2015 |  | 37,000 |
| 5.25% unsecured senior notes due June 2015 |  | 140,000 |
|  |  | 257,000 |
June 2011 | 5.45% unsecured senior notes due August 2012 | Open market repurchases | 7,306 |
| 5.125% unsecured senior notes due October 2013 |  | 45,690 |
|  |  | 52,996 |
February 2011 | 8.125% unsecured senior notes due February 2011 | Scheduled maturity | 13,900 |
Total 2011 |  |  | $ | 323,896 |
December 2010 | 7.875% unsecured notes due February 2011 | Early redemption as | 85,595 |
| 7.875% unsecured notes due July 2011 | provided within indenture | 132,186 |
| 7.50% unsecured notes due January 2012 | agreements | 110,262 |
|  |  | 328,043 |
November 2010 | 5.45% unsecured notes due August 2012 | Open market repurchases | 23,000 |
October 2010 | 4.55% unsecured notes due November 2010 | Scheduled maturity | 47,427 |
October 2010 | 6.25% unsecured notes due February 2013 | Tender offer | 162,471 |
| 5.125% unsecured notes due October 2013 |  | 104,749 |
| 5.25% unsecured notes due January 2014 |  | 128,077 |
| 5.70% unsecured notes due May 2014 |  | 31,329 |
| 5.20% unsecured notes due February 2015 |  | 47,838 |
| 5.25% unsecured notes due June 2015 |  | 25,536 |
|  |  | 500,000 |
Total 2010 | $ | 898,470 |
September 2009 | 4.55% unsecured notes due November 2010 | Tender offer | 252,573 |
| 7.875% unsecured notes due February 2011 |  | 306,905 |
| 8.125% unsecured notes due February 2011 |  | 186,098 |
| 7.875% unsecured notes due July 2011 |  | 341,377 |
| 7.50% unsecured notes due January 2012 |  | 214,662 |
| 5.45% unsecured notes due August 2012 |  | 168,301 |
| 5.125% unsecured notes due October 2013 |  | 30,084 |
|  |  | 1,500,000 |
September 2009 | 5.80% unsecured notes due September 2009 | Scheduled maturity | 210,920 |
July 2009 | 4.875% unsecured notes due July 2009 | Scheduled maturity | 25,413 |
May / June 2009 | 7.875% unsecured notes due July 2011 | Open market repurchases | 25,000 |
| 6.25% unsecured notes due February 2013 |  | 74,785 |
| 5.25% unsecured notes due January 2014 |  | 36,004 |
| 5.20% unsecured notes due February 2015 |  | 57,135 |
|  |  | 192,924 |
Total 2009 | $ | 1,929,257 |
Total for three-year period | $ | 3,151,623 |
Schedule of Financial Services available credit lines | The following is aggregate borrowing information for our mortgage operations ($000’s omitted):
| 2011 |  | 2010 |  | 2009
Available credit lines at year-end | $ | 2,500 |  |  | $ | 2,500 |  |  | $ | 175,000 |
Unused credit lines at year-end | $ | 2,500 |  |  | $ | 2,500 |  |  | $ | 157,000 |
Maximum amount outstanding at the end of any month | $ | — |  |  | $ | 75,403 |  |  | $ | 79,422 |
Average monthly indebtedness | $ | — |  |  | $ | 17,241 |  |  | $ | 44,522 |
Range of interest rates during the year: | N/A |  |  | 4.25 | % |  | 0.53 | %
|  |  | to |  |  | to |
|  |  | 4.50 | % |  | 4.75 | %
Weighted-average rate at year-end | 4.50 | % |  | 4.50 | % |  | 4.29 | %

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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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