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Debt and Credit Agreements (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 7.33% weighted-average fixed rate notes | Dec. 31, 2013 7.33% weighted-average fixed rate notes | Mar. 31, 2014 6.51% weighted-average fixed rate notes | Dec. 31, 2013 6.51% weighted-average fixed rate notes | Mar. 31, 2014 9.78% notes | Dec. 31, 2013 9.78% notes | Mar. 31, 2014 5.58% weighted-average fixed rate notes | Dec. 31, 2013 5.58% weighted-average fixed rate notes | Mar. 31, 2014 Revolving Credit Facility | Dec. 31, 2013 Revolving Credit Facility | Apr. 15, 2014 Revolving Credit Facility Subsequent event
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Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  | $ 20,000,000 | $ 20,000,000 | $ 425,000,000 | $ 425,000,000 | $ 67,000,000 | $ 67,000,000 | $ 175,000,000 | $ 175,000,000 | $ 535,000,000 | $ 460,000,000 |
Long-term debt | 1,222,000,000 | 1,147,000,000 |  |  |  |  |  |  |  |  | 535,000,000 |  |
Weighted-average interest rate (as a percent) |  |  | 7.33% | 7.33% | 6.51% | 6.51% |  |  | 5.58% | 5.58% | 2.20% |  |
Availability under the credit facility |  |  |  |  |  |  |  |  |  |  | 864,000,000 |  |
Interest rate (as a percent) |  |  |  |  |  |  | 9.78% | 9.78% |  |  |  |  |
Borrowing base prior to approval |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000,000
Borrowing base |  |  |  |  |  |  |  |  |  |  |  |  | 3,100,000,000
Line of credit |  |  |  |  |  |  |  |  |  |  | $ 1,400,000,000 |  |

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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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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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