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Non-Recourse Obligations of Variable Interest Entity (Schedule of Non-recourse Obligations) (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  |  |  | 1 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Letter of Credit | Dec. 31, 2012 Notes Payable to VIE Members | Dec. 31, 2011 Notes Payable to VIE Members | Dec. 31, 2012 Construction and Term Loan Facility | Dec. 31, 2011 Construction and Term Loan Facility | Dec. 31, 2012 Corporate Debt Securities | Dec. 31, 2011 Corporate Debt Securities | Dec. 31, 2012 LVE | Dec. 31, 2011 LVE | Dec. 31, 2010 LVE | Dec. 31, 2012 LVE Construction and Term Loan Facility | Dec. 31, 2011 LVE Construction and Term Loan Facility | Dec. 31, 2007 LVE Construction and Term Loan Facility | Dec. 31, 2012 LVE Construction Loans | Jul. 31, 2011 LVE Corporate Debt Securities | Dec. 31, 2007 LVE Corporate Debt Securities | Mar. 01, 2013 Echelon Development Subsequent Event
For the year ending December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse obligations of variable interest entity, current | $ 225,113,000 | $ 29,686,000 |  |  | $ 33,061,000 | $ 29,686,000 | $ 119,052,000 | $ 0 | $ 73,000,000 | $ 0 |  |  |  |  |  |  |  |  |  |
Non-recourse debt of variable interest entity, long-term | 0 | 192,980,000 |  |  |  |  | 0 | 119,980,000 | 0 | 73,000,000 |  |  |  |  |  |  |  |  |  |
Non-recourse obligations | 225,113,000 | 222,666,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets pledged as security not separately reported |  |  |  |  |  |  |  |  |  |  | 163,500,000 | 163,800,000 |  |  |  |  |  |  |  |
Restricted investments held by variable interest entity | 21,382,000 | 21,367,000 |  |  |  |  |  |  |  |  | 21,400,000 |  |  |  |  |  |  |  |  |
Net income (loss) attributable to noncontrolling interest | (14,210,000) | (4,145,000) | 1,940,000 |  |  |  |  |  |  |  | 1,500,000 | 5,900,000 | 15,200,000 |  |  |  |  |  |  |
Net cash provided by operating activities | 142,445,000 | 253,510,000 | 269,391,000 |  |  |  |  |  |  |  | 2,300,000 | 6,700,000 | 21,400,000 |  |  |  |  |  |  |
Construction and Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction and term loan facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 143,500,000 |  |  |  |
Construction and term loan facility, amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 119,100,000 | 120,000,000 |  |  |  |  |
Construction and term loan facility, loan maturities for remainder of current year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 83,100,000 |  |  |
Construction and term loan facility, repayments of principal, due in prior year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,200,000 |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |
Debt instrument, repayments made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,000,000 |  |
Letter of credit provided by VIE members as collateral on VIE debt |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of real estate development, consideration received, gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000

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- Definition The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -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 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 + Details
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