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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 $ 48,825 $ 34,262  
Property, plant and equipment, net 1,734,691 1,556,378  
Construction-in-process 293,542 306,709  
Total assets 2,623,864 [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 1,321,748 1,288,525  
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 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  
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.