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Derivative Instruments (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Fair value amount of derivative instrument |  |
Accounts receivable | $ 4,344 | $ 4,587
Current portion of derivative assets | 15,608 | 16,758
Derivative assets | 139,651 | 45,525
Accrued liabilities | (11,448) | (11,498)
Current portion of derivative liabilities | (43,973) | (50,603)
Derivative Liabilities | (249,245) | (149,362)
Interest Rate Swap Agreement [Member] |  |
Fair value amount of derivative instrument |  |
Accounts receivable | 4,344 | 4,587
Current portion of derivative assets | 15,608 | 16,758
Derivative assets | 139,651 | 45,525
Accrued liabilities | (11,448) | (11,498)
Current portion of derivative liabilities | (43,973) | (50,603)
Derivative Liabilities | (248,645) | (139,362)
Toledo Spirit Time Charter Derivative [Member] |  |
Fair value amount of derivative instrument |  |
Accounts receivable | 0 | 0
Current portion of derivative assets | 0 | 0
Derivative assets | 0 | 0
Accrued liabilities | 0 | 0
Current portion of derivative liabilities | 0 | 0
Derivative Liabilities | $ (600) | $ (10,000)

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 03 -Paragraph 15 -Subparagraph 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 15 -Subparagraph a + Details
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- Definition Sum as of the balance sheet date of the (a) fair values of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and (b) the carrying amounts of the liabilities arising from financial instruments or contracts used to mitigate a specified risk (hedge), and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements. + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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