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Debt (Tables) | 12 Months Ended
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Dec. 31, 2011
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Text Block] | Long-term debt consists of the following at December 31:
|  | 2011 |  | 2010
Revolving credit facility |  | $ | 74,000 |  |  | $ | — |
Asset securitization program |  | 280,000 |  |  | — |
Bank term loan, due 2012 |  | — |  |  | 200,000 |
6.875% senior notes, due 2013 |  | 341,937 |  |  | 349,833 |
3.375% notes, due 2015 |  | 260,461 |  |  | 249,155 |
6.875% senior debentures, due 2018 |  | 198,660 |  |  | 198,450 |
6.00% notes, due 2020 |  | 299,927 |  |  | 299,918 |
5.125% notes, due 2021 |  | 249,278 |  |  | 249,199 |
7.5% senior debentures, due 2027 |  | 197,890 |  |  | 197,750 |
Interest rate swaps designated as fair value hedges |  | — |  |  | 14,082 |
Other obligations with various interest rates and due dates |  | 25,670 |  |  | 2,816 |
|  | $ | 1,927,823 |  |  | $ | 1,761,203 |
Schedule of Fair Value of Debt [Text Block] | The estimated fair market value at December 31, using quoted market prices, is as follows:
|  | 2011 |  | 2010
6.875% senior notes, due 2013 |  | $ | 352,000 |  |  | $ | 385,000 |
3.375% notes, due 2015 |  | 250,000 |  |  | 243,000 |
6.875% senior debentures, due 2018 |  | 216,000 |  |  | 218,000 |
6.00% notes, due 2020 |  | 315,000 |  |  | 306,000 |
5.125% notes, due 2021 |  | 247,500 |  |  | 238,000 |
7.5% senior debentures, due 2027 |  | 244,000 |  |  | 204,000 |

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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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