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Debt and Credit Agreements (Details 2) (USD $) | 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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Jul. 31, 2001 7.33% Weighted-Average Fixed Rate Notes tranche investor | Dec. 31, 2012 7.33% Weighted-Average Fixed Rate Notes Greater than quarter | Dec. 31, 2010 7.33% Weighted-Average Fixed Rate Notes Tranche 1 due July 2011 | Jul. 31, 2001 7.33% Weighted-Average Fixed Rate Notes Tranche 1 due July 2011 | Jul. 31, 2001 7.33% Weighted-Average Fixed Rate Notes Tranche 2 due July 2013 | Jul. 31, 2001 7.33% Weighted-Average Fixed Rate Notes Tranche 3 due July 2026 | Jul. 31, 2008 6.51% Weighted-Average Fixed Rate Notes tranche investor | Dec. 31, 2012 6.51% Weighted-Average Fixed Rate Notes Greater than quarter | Jul. 31, 2008 6.51% Weighted-Average Fixed Rate Notes Tranche 1 due July 2018 | Jul. 31, 2008 6.51% Weighted-Average Fixed Rate Notes Tranche 2 due July 2020 | Jul. 31, 2008 6.51% Weighted-Average Fixed Rate Notes Tranche 3 due July 2023 | Dec. 31, 2008 9.78% Notes investor | Dec. 31, 2012 9.78% Notes | Dec. 31, 2011 9.78% Notes | Dec. 31, 2010 5.58% Weighted-Average Fixed Rate Notes investor tranche | Dec. 31, 2010 5.58% Weighted-Average Fixed Rate Notes Tranche 1 due January 2021 | Dec. 31, 2010 5.58% Weighted-Average Fixed Rate Notes Tranche 2 due January 2023 | Dec. 31, 2010 5.58% Weighted-Average Fixed Rate Notes Tranche 3 due January 2026 | Dec. 31, 2012 Revolving Credit Facility quarter | May 31, 2012 Revolving Credit Facility | Dec. 31, 2012 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
Number of trailing quarters used to calculate annual coverage ratio |  | 4 |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  | 4 |  |
Payment of make-whole premium due to early repayment of debt |  |  | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000,000 | 900,000,000 |
Contingent increase of maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000 |
Capitalized debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 |
Unamortized debt issuance costs associated with the original credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 |
Period to reduce outstanding debt in equal monthly installments to the adjusted credit line available |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |
Remaining unamortized costs under amended credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000 |

X
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- 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 For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of the original 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 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 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 The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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. + 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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