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Debt and Credit Agreements (Details) (USD $) |  |  |  |  |  |  | 1 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 7.33% Weighted-Average Fixed Rate Notes | Dec. 31, 2011 7.33% Weighted-Average Fixed Rate Notes | Dec. 31, 2012 6.51% Weighted-Average Fixed Rate Notes | Dec. 31, 2011 6.51% Weighted-Average Fixed Rate Notes | Dec. 31, 2008 9.78% Notes | Dec. 31, 2012 9.78% Notes | Dec. 31, 2011 9.78% Notes | Dec. 31, 2012 5.58% Weighted-Average Fixed Rate Notes | Dec. 31, 2011 5.58% Weighted-Average Fixed Rate Notes | Dec. 31, 2012 Revolving Credit Facility | May 31, 2012 Revolving Credit Facility | Dec. 31, 2011 Revolving Credit Facility | Dec. 31, 2012 Senior Notes Greater than
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility |  |  | $ 95,000,000 | $ 95,000,000 | $ 425,000,000 | $ 425,000,000 |  | $ 67,000,000 | $ 67,000,000 | $ 175,000,000 | $ 175,000,000 | $ 325,000,000 |  | $ 188,000,000 |
Current portion of long-term debt | (75,000,000) |  | (75,000,000) |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, excluding Current Maturities | 1,012,000,000 | 950,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate (as a percent) |  |  | 7.33% | 7.33% | 6.51% | 6.51% |  |  |  | 5.58% | 5.58% | 2.20% |  | 4.90% |
Interest rate (as a percent) |  |  |  |  |  |  | 9.78% | 9.78% | 9.78% |  |  |  |  |  |
Availability under the credit facility |  |  |  |  |  |  |  |  |  |  |  | 574,000,000 |  |  |
Debt due in 2013 | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt due in 2016 | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt due in 2018 | 245,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period of debt |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Asset coverage ratio after amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75
Capitalized debt issuance costs, as amended September 2010 |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 |  |
Line of credit, outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 325,000,000 |  | $ 188,000,000 |

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- Definition Interest rate stated in the contractual 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 For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 + Details
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