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Non-Recourse Obligations of Variable Interest Entity (Schedule of Non-recourse Obligations) (Details) (USD $)
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12 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | ||||||||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
Letter of Credit
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Dec. 31, 2012
Notes Payable to VIE Members
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Dec. 31, 2011
Notes Payable to VIE Members
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Dec. 31, 2012
Construction and Term Loan Facility
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Dec. 31, 2011
Construction and Term Loan Facility
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Dec. 31, 2012
Corporate Debt Securities
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Dec. 31, 2011
Corporate Debt Securities
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Dec. 31, 2012
LVE
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Dec. 31, 2011
LVE
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Dec. 31, 2010
LVE
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Dec. 31, 2012
LVE
Construction and Term Loan Facility
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Dec. 31, 2011
LVE
Construction and Term Loan Facility
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Dec. 31, 2007
LVE
Construction and Term Loan Facility
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Dec. 31, 2012
LVE
Construction Loans
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Jul. 31, 2011
LVE
Corporate Debt Securities
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Dec. 31, 2007
LVE
Corporate Debt Securities
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Mar. 01, 2013
Echelon Development
Subsequent Event
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| 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 | |||||||||||||||||||