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DEBT AND CREDIT AGREEMENTS (Details) (USD $) | Jun. 30, 2013 | Apr. 17, 2013 | Dec. 31, 2012
--- | --- | --- | ---
Debt |  |  |
Current Maturities | $ (75,000,000) |  | $ (75,000,000)
Long-Term Debt, excluding current maturities | 1,067,000,000 |  | 1,012,000,000
Borrowing base prior to approval |  | 1,700,000,000 |
Borrowing base |  | 2,300,000,000 |
7.33% weighted-average fixed rate notes |  |  |
Debt |  |  |
Total debt | 95,000,000 |  | 95,000,000
Current Maturities | (75,000,000) |  | (75,000,000)
Weighted-average interest rate (as a percent) | 7.33% |  | 7.33%
6.51% weighted-average fixed rate notes |  |  |
Debt |  |  |
Total debt | 425,000,000 |  | 425,000,000
Weighted-average interest rate (as a percent) | 6.51% |  | 6.51%
9.78% notes |  |  |
Debt |  |  |
Total debt | 67,000,000 |  | 67,000,000
Interest rate (as a percent) | 9.78% |  | 9.78%
5.58% weighted-average fixed rate notes |  |  |
Debt |  |  |
Total debt | 175,000,000 |  | 175,000,000
Weighted-average interest rate (as a percent) | 5.58% |  | 5.58%
Revolving Credit Facility |  |  |
Debt |  |  |
Total debt | 380,000,000 |  | 325,000,000
Weighted-average interest rate (as a percent) | 2.00% |  |
Availability under the credit facility | 519,000,000 |  |
Line of credit | $ 900,000,000 |  |

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- Definition Represents the maximum borrowing capacity under the credit facility before amendment. + References No definition available. + 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 Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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