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Debt and Credit Agreements (Details 2) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jul. 31, 2001 7.33% weighted-average fixed rate notes item | Dec. 31, 2013 7.33% weighted-average fixed rate notes | Dec. 31, 2013 7.33% weighted-average fixed rate notes Greater than Q | Jul. 31, 2001 7.33% weighted-average fixed rate notes 7.33% Weighted-Average Fixed Rate Notes Tranche 1 due July 2011 | Jul. 31, 2001 7.33% weighted-average fixed rate notes 7.33% Weighted-Average Fixed Rate Notes Tranche 2 due July 2013 | Jul. 31, 2001 7.33% weighted-average fixed rate notes 7.33% Weighted-Average Fixed Rate Notes Tranche 3 due July 2016 | Jul. 31, 2008 6.51% weighted-average fixed rate notes item | Dec. 31, 2013 6.51% weighted-average fixed rate notes Greater than Q | Jul. 31, 2008 6.51% weighted-average fixed rate notes 6.51% Weighted-Average Fixed Rate Notes Tranche 1 due July 2018 | Jul. 31, 2008 6.51% weighted-average fixed rate notes 6.51% Weighted-Average Fixed Rate Notes Tranche 2 due July 2020 | Jul. 31, 2008 6.51% weighted-average fixed rate notes 6.51% Weighted-Average Fixed Rate Notes Tranche 3 due July 2023 | Dec. 31, 2008 9.78% notes item | Dec. 31, 2013 9.78% notes | Dec. 31, 2012 9.78% notes | Dec. 31, 2010 5.58% weighted-average fixed rate notes item | Dec. 31, 2010 5.58% weighted-average fixed rate notes 5.58% Weighted-Average Fixed Rate Notes Tranche 1 due January 2021 | Dec. 31, 2010 5.58% weighted-average fixed rate notes 5.58% Weighted-Average Fixed Rate Notes Tranche 2 due January 2023 | Dec. 31, 2010 5.58% weighted-average fixed rate notes 5.58% Weighted-Average Fixed Rate Notes Tranche 3 due January 2026 | Dec. 31, 2013 Revolving Credit Facility | Dec. 31, 2013 Revolving Credit Facility Q | Dec. 30, 2013 Revolving Credit Facility | May 31, 2012 Revolving Credit Facility | Dec. 31, 2013 Revolving Credit Facility Greater than
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of institutional investors that purchased debt in a private placement offering |  |  |  | 7 |  |  |  |  |  | 41 |  |  |  |  | 4 |  |  | 8 |  |  |  |  |  |  |  |
Number of tranches |  |  |  | 3 |  |  |  |  |  | 3 |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Principal |  |  |  | $ 170,000,000 |  |  | $ 75,000,000 | $ 75,000,000 | $ 20,000,000 | $ 425,000,000 |  | $ 245,000,000 | $ 100,000,000 | $ 80,000,000 | $ 67,000,000 |  |  | $ 175,000,000 | $ 88,000,000 | $ 25,000,000 | $ 62,000,000 |  |  |  |  |
Term |  |  |  |  |  |  | 10 years | 12 years | 15 years |  |  | 10 years | 12 years | 15 years | 10 years |  |  |  | 10 years | 12 years | 15 years |  |  |  |  |
Coupon (as a percent) |  |  |  |  |  |  | 7.26% | 7.36% | 7.46% |  |  | 6.44% | 6.54% | 6.69% | 9.78% | 9.78% | 9.78% |  | 5.42% | 5.59% | 5.80% |  |  |  |  |
Asset coverage ratio |  |  |  |  |  | 1.75 |  |  |  |  | 1.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75
Annual coverage ratio |  |  |  |  |  | 2.8 |  |  |  |  | 2.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.8
Repayments of debt | 895,000,000 | 263,000,000 | 355,000,000 |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trailing quarters used to calculate annual coverage ratio |  |  |  |  |  | 4 |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |
Borrowing base |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000,000 | 2,300,000,000 |  |  |
Line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000,000 | 900,000,000 |
Increase of maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000 |
Debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  |
Period to reduce outstanding debt in equal monthly installments to the adjusted credit line available |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |
Remaining unamortized costs under amended credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,600,000 | $ 10,600,000 |  |  |

X
- Definition Represents the available line of credit. + References No definition available. + Details
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X
- Definition Represents the required annual coverage ratio of operating cash flow to interest expense under the terms of the agreement. + References No definition available. + Details
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- Definition Represents the required asset coverage ratio under the terms of the agreement. + References No definition available. + Details
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- Definition Represents the number of trailing quarters used to calculate the annual coverage ratio. + References No definition available. + Details
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- Definition Number of institutional investors that purchased debt in a private placement offering. + References No definition available. + Details
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- Definition Increased 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, if any one or more of the existing banks or new banks agree to provide such increased commitment amount. + References No definition available. + Details
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- Definition Represents the period over which the entity has to reduce its outstanding borrowings in the event that the adjusted credit line available is less than outstanding borrowings. + References No definition available. + Details
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- Definition Represents the maturity period of long-term debt. + References No definition available. + Details
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- Definition Number of tranches in which long-term debt is issued. + References No definition available. + Details
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- Definition For an unclassified balance sheet, the amount, as of the balance sheet date, of remaining capitalized costs associated with the amended credit facility (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the amended credit facility. Such amount is before the consideration of accumulated amortization. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: 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 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 + 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 Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + 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 The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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