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Financial Instruments (Details Textual) (USD $) In Millions, unless otherwise specified | Aug. 31, 2010 | Dec. 31, 2012 MCFs Non Recourse Debt [Member] | Jan. 01, 2012 MCFs Non Recourse Debt [Member]
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Financial Instruments (Textual) [Abstract] |  |  |
Principal amount of guaranteed investment related to debt service reserve fund |  |  | $ 23.9
Guaranteed investment related to bond fund payment |  |  | $ 9.9
Stated interest rate of MCF revenue bond | 8.47% | 8.47% | 8.47%

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- Definition Guaranteed investment related to bond fund payment. + References No definition available. + Details
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- Definition Principal amount of guaranteed investment related to debt service reserve fund. + References No definition available. + Details
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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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