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Equity method investments (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 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
Frederickson
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Dec. 31, 2011
Frederickson
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Dec. 31, 2012
Badger Creek Limited
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Dec. 31, 2011
Badger Creek Limited
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Dec. 31, 2010
Badger Creek Limited
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Dec. 31, 2012
Orlando Cogen, LP
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Dec. 31, 2011
Orlando Cogen, LP
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Dec. 31, 2010
Orlando Cogen, LP
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Dec. 31, 2012
Onondaga Renewables, LLC
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Dec. 31, 2011
Onondaga Renewables, LLC
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Dec. 31, 2010
Onondaga Renewables, LLC
|
Sep. 30, 2011
Onondaga Renewables, LLC
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Dec. 31, 2012
Koma Kulshan Associates
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Dec. 31, 2011
Koma Kulshan Associates
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Dec. 31, 2010
Koma Kulshan Associates
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Dec. 31, 2012
Chambers Cogen, LP
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Dec. 31, 2011
Chambers Cogen, LP
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Dec. 31, 2010
Chambers Cogen, LP
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Dec. 31, 2012
Delta-Person, LP
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Dec. 31, 2012
Rockland Wind Farm
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Dec. 31, 2011
Rockland Wind Farm
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Dec. 31, 2012
Idaho Wind Partners 1, LLC
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Dec. 31, 2011
Idaho Wind Partners 1, LLC
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Dec. 31, 2010
Idaho Wind Partners 1, LLC
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Dec. 31, 2012
Selkirk Cogen Partners, LP
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Dec. 31, 2011
Selkirk Cogen Partners, LP
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Dec. 31, 2010
Selkirk Cogen Partners, LP
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Dec. 31, 2012
Gregory Power Partners, LP
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Dec. 31, 2011
Gregory Power Partners, LP
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Dec. 31, 2010
Gregory Power Partners, LP
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Dec. 31, 2012
Goshen North
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Dec. 31, 2012
PERH
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Dec. 31, 2011
PERH
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Feb. 16, 2012
PERH
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Dec. 31, 2012
Other
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Dec. 31, 2011
Other
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Dec. 31, 2010
Other
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Dec. 31, 2012
Power L.P.
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Dec. 31, 2011
Power L.P.
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| Equity method investments | ||||||||||||||||||||||||||||||||||||||||||
| Percentage of ownership interest | 50.00% | 50.00% | 50.00% | 50.00% | 49.80% | 40.00% | 40.00% | 50.00% | 27.60% | 18.50% | 17.10% | 12.50% | 14.30% | |||||||||||||||||||||||||||||
| Carrying value | $ 428,690 | $ 474,351 | $ 167,723 | $ 166,837 | $ 6,477 | $ 19,930 | $ 25,955 | $ 167 | $ 291 | $ 6,393 | $ 5,856 | $ 154,300 | $ 143,797 | $ 12,500 | $ 34,703 | $ 36,143 | $ 33,700 | $ 47,357 | $ 2,796 | $ 3,520 | $ 8,978 | $ 25,609 | $ 9 | |||||||||||||||||||
| Percentage of ownership, before increase | 30.00% | |||||||||||||||||||||||||||||||||||||||||
| Equity in earnings of unconsolidated affiliates | 15,246 | 6,356 | 13,777 | (2,778) | (4) | 749 | 3,200 | 863 | 2,031 | (433) | (1,761) | (320) | 537 | 483 | 452 | 17,082 | 7,739 | 13,144 | (7,997) | (193) | (1,563) | (126) | 7,640 | (406) | (3,454) | (725) | 524 | 2,162 | (1,963) | 38 | (10) | (1) | (861) | 886 | 444 | |||||||
| Distributions from equity method investments | (38,347) | (21,889) | (16,843) | |||||||||||||||||||||||||||||||||||||||
| Equity in earnings (loss) of unconsolidated affiliates, net of distributions | $ (23,101) | $ (15,533) | $ (3,066) | |||||||||||||||||||||||||||||||||||||||