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Debt (Tables) | 12 Months Ended
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Dec. 31, 2012
Debt Disclosure [Abstract] |
Schedule of Senior Notes | Our senior notes are summarized as follows ($000’s omitted):
| December 31,
| 2012 |  | 2011
5.45% unsecured senior notes due August 2012 (a) | — |  |  | 96,795 |
6.25% unsecured senior notes due February 2013 (a) | — |  |  | 62,677 |
5.125% unsecured senior notes due October 2013 (a) | — |  |  | 117,197 |
5.25% unsecured senior notes due January 2014 (a) | 187,970 |  |  | 255,882 |
5.70% unsecured senior notes due May 2014 (a) | 208,274 |  |  | 311,900 |
5.20% unsecured senior notes due February 2015 (a) | 95,615 |  |  | 207,906 |
5.25% unsecured senior notes due June 2015 (a) | 264,058 |  |  | 270,551 |
6.50% unsecured senior notes due May 2016 (a) | 457,154 |  |  | 469,147 |
7.625% unsecured senior notes due October 2017 (b) | 149,481 |  |  | 149,373 |
7.875% unsecured senior notes due June 2032 (a) | 299,152 |  |  | 299,108 |
6.375% unsecured senior notes due May 2033 (a) | 398,492 |  |  | 398,418 |
6.00% unsecured senior notes due February 2035 (a) | 299,417 |  |  | 299,390 |
7.375% unsecured senior notes due June 2046 (a) | 150,000 |  |  | 150,000 |
Total senior notes – carrying value (c) | $ | 2,509,613 |  |  | $ | 3,088,344 |
Estimated fair value | $ | 2,663,451 |  |  | $ | 2,765,151 |
Schedule of Financial Services available credit lines | The following is aggregate borrowing information for our mortgage operations as of each year-end ($000’s omitted):
| December 31,
| 2012 |  | 2011 |  | 2010
Available credit lines | $ | 150,000 |  |  | $ | 2,500 |  |  | $ | 2,500 |
Unused credit lines | $ | 11,205 |  |  | $ | 2,500 |  |  | $ | 2,500 |
Weighted-average interest rate | 3.00 | % |  | 4.50 | % |  | 4.50 | %

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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 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 2: 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 3: 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 4: 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 5: 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 6: 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 7: 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 8: 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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 10: 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 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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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -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 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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