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Note 6 - Variable Interest Entities - Assets and Liabilities for the Company's 2015 Variable Interest Entity (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Restricted cash and cash equivalents (primarily related to VIEs) | $ 48,825 |  | $ 34,262 |  |
Property, plant and equipment, net | 1,734,691 |  | 1,556,378 |  |
Construction-in-process | 293,542 |  | 306,709 |  |
Total assets | 2,586,662 | [1] | 2,461,569 | [1] | $ 2,273,982
Accounts payable and accrued expenses | 153,796 |  | 91,650 |  |
Long-term debt | 877,064 |  |  |  |
Other long-term liabilities | 18,853 |  | 21,294 |  |
Total liabilities | 1,259,787 |  | 1,286,790 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Property, plant and equipment, net | 1,631,900 |  | 1,483,224 |  |
Construction-in-process | 142,717 |  | 120,853 |  |
Variable Interest Entity, Primary Beneficiary [Member] | Project Debt [Member] |  |  |  |  |
Restricted cash and cash equivalents (primarily related to VIEs) | 48,676 |  | 34,262 |  |
Other current assets | 124,322 |  | 157,351 |  |
Property, plant and equipment, net | 1,252,623 |  | 1,305,254 |  |
Construction-in-process | 129,832 |  | 48,128 |  |
Other long-term assets | 63,667 |  | 24,802 |  |
Total assets | 1,619,120 |  | 1,569,797 |  |
Accounts payable and accrued expenses | 24,887 |  | 10,900 |  |
Long-term debt | 658,726 |  | 668,815 |  |
Other long-term liabilities | 93,682 |  | 126,879 |  |
Total liabilities | 777,295 |  | 806,594 |  |
Variable Interest Entity, Primary Beneficiary [Member] | Power Purchase Agreements [Member] |  |  |  |  |
Restricted cash and cash equivalents (primarily related to VIEs) |  |  |  |  |
Other current assets | 18,010 |  | 7,482 |  |
Property, plant and equipment, net | 379,277 |  | 177,970 |  |
Construction-in-process | 12,885 |  | 72,725 |  |
Other long-term assets | 276 |  |  |  |
Total assets | 410,448 |  | 258,177 |  |
Accounts payable and accrued expenses | 6,863 |  | 3,992 |  |
Long-term debt |  |  |  |  |
Other long-term liabilities | 6,757 |  | 5,779 |  |
Total liabilities | $ 13,620 |  | $ 9,771 |  |
[1] | Electricity segment assets include goodwill in the amount of $21.0 million and $6.7 million as of December 31, 2017 and 2016, respectively.

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