Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017		Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 77,212		$ 230,214
Restricted cash and cash equivalents (primarily related to VIEs)	42,559		34,262
Receivables:
Trade	98,384		80,807
Other	11,591		17,482
Inventories	18,685		12,000
Costs and estimated earnings in excess of billings on uncompleted contracts	42,087		52,198
Prepaid expenses and other	41,727		45,867
Total current assets	332,245		472,830
Investment in an unconsolidated company	25,367
Deposits and other	17,371		18,553
Deferred charges	43,972		43,773
Property, plant and equipment, net ($1,518,962 and $1,483,224 related to VIEs, respectively)	1,621,012		1,556,378
Construction-in-process ($105,848 and $120,853 related to VIEs, respectively)	350,872		306,709
Deferred financing and lease costs, net	5,426		3,923
Intangible assets, net	86,806		52,753
Goodwill	20,667		6,650
Total assets	2,503,738	[1]	2,461,569
Current liabilities:
Accounts payable and accrued expenses	103,335		91,650
Short term revolving credit lines with banks (full recourse)	33,900
Billings in excess of costs and estimated earnings on uncompleted contracts	6,015		31,630
Current portion of long-term debt:
Senior secured notes	27,847		32,234
Other loans	21,495		21,495
Full recourse	864		12,242
Total current liabilities	193,456		189,251
Long-term debt, net of current portion:
Senior secured notes (less deferred financing costs of $8,202 and $9,177, respectively)	322,299		350,388
Other loans (less deferred financing costs of $5,496 and $6,409, respectively)	247,401		261,845
Senior unsecured bonds (less deferred financing costs of $617 and $755, respectively)	203,715		203,577
Other loans (less deferred financing costs of $1,043 and $1,346, respectively)	48,957		57,063
Investment in an unconsolidated company			11,081
Liability associated with sale of tax benefits	46,803		54,662
Deferred lease income	52,273		54,561
Deferred income taxes	54,495		35,382
Liability for unrecognized tax benefits	6,188		5,738
Liabilities for severance pay	20,364		18,600
Asset retirement obligation	24,740		23,348
Other long-term liabilities	19,121		21,294
Total liabilities	1,239,812		1,286,790
Commitments and contingencies (Note 10)
Redeemable nonconrolling interest	6,481		4,772
Equity:
Common stock, par value $0.001 per share; 200,000,000 shares authorized; 50,597,124 and 49,667,340 shares issued and outstanding as of September 30, 2017 and December 31, 2016, respectively	51		50
Additional paid-in capital	896,005		869,463
Retained earnings	289,561		216,644
Accumulated other comprehensive income (loss)	(5,634)		(7,732)
Noncontrolling interest	77,462		91,582
Total equity	1,257,445		1,170,007
Total liabilities, redeemable nonconrolling interest and equity	2,503,738		2,461,569
Variable Interest Entity, Primary Beneficiary [Member]
Receivables:
Property, plant and equipment, net ($1,518,962 and $1,483,224 related to VIEs, respectively)	1,518,962		1,483,224
Construction-in-process ($105,848 and $120,853 related to VIEs, respectively)	105,848		120,853
Equity:
	$ 1,179,983		$ 1,078,425

[1] Electricity segment assets include goodwill in the amount of $20.7 million