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Investment in Sunrise Energy (Condensed Statement of Operations - Sunrise) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Revenue | $ 66,322 |  | $ 37,660 |  | $ 140,549 |  | $ 116,058 |
Expenses | (73,531) |  | (31,162) |  | (139,546) |  | (91,383) |
Net income (loss) | (5,768) | [1] | 4,830 | [1] | 826 | [1] | 18,463 | [1]
Sunrise Energy [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 2,328 |  | 2,551 |
Expenses |  |  |  |  | (1,945) |  | (1,513) |
Net income (loss) |  |  |  |  | $ 383 |  | $ 1,038 |
[1] | There is no material difference between net income (loss) and comprehensive income (loss).

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