Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 70,724,000	$ 40,230,000
Restricted cash and cash equivalents (all related to VIEs)	115,530,000	93,248,000
Receivables:
Trade	56,300,000	48,609,000
Related entity		451,000
Other	9,732,000	10,141,000
Due from Parent		1,337,000
Inventories	17,286,000	16,930,000
Costs and estimated earnings in excess of billings on uncompleted contracts	7,426,000	27,793,000
Deferred income taxes	496,000	251,000
Prepaid expenses and other	29,566,000	34,884,000
Total current assets	307,060,000	273,874,000
Deposits and other	17,963,000	20,044,000
Deferred charges	37,301,000	37,567,000
Property, plant and equipment, net ($1,421,996 and $1,339,342 related to VIEs, respectively)	1,535,757,000	1,437,637,000
Construction-in-process ($82,045 and $162,006 related to VIEs, respectively)	230,037,000	296,722,000
Deferred financing and lease costs, net	27,369,000	27,057,000
Intangible assets, net	27,846,000	28,655,000
Total assets	2,183,333,000	2,121,556,000
Accounts payable and accrued expenses	83,676,000	88,276,000
Deferred income taxes	975,000	974,000
Short term revolving credit lines with banks (full recourse)	30,600,000	20,300,000
Billings in excess of costs and estimated earnings on uncompleted contracts	57,861,000	24,724,000
Limited and non-recourse (all related to VIEs):
Senior secured notes	36,544,000	34,368,000
Other loans	17,995,000	17,995,000
Full recourse	17,203,000	19,116,000
Total current liabilities	244,854,000	205,753,000
Limited and non-recourse (all related to VIEs):
Senior secured notes	355,776,000	360,366,000
Other loans	260,125,000	264,625,000
Full recourse:
Senior unsecured bonds (plus unamortized premium based upon 7% of $744)	250,212,000	250,289,000
Other loans	32,684,000	34,351,000
Unconsolidated investments	7,688,000	3,617,000
Liability associated with sale of tax benefits	33,685,000	39,021,000
Deferred lease income	59,815,000	60,560,000
Deferred income taxes	70,247,000	66,220,000
Liability for unrecognized tax benefits	7,190,000	7,511,000
Liabilities for severance pay	18,499,000	20,399,000
Asset retirement obligation	19,514,000	19,142,000
Other long-term liabilities	3,872,000	2,956,000
Total liabilities	1,364,161,000	1,334,810,000
Commitments and contingencies (Note 10)
The Company's stockholders' equity:
Common stock, par value $0.001 per share; 200,000,000 shares authorized; 48,828,331 and 45,537,162 shares issued and outstanding as of March 31, 2015 and December 31, 2014, respectively	49,000	46,000
Additional paid-in capital	771,591,000	742,006,000
Retained earnings	47,673,000	41,539,000
Accumulated other comprehensive income	(11,971,000)	(8,668,000)
	807,342,000	774,923,000
Noncontrolling interest	11,830,000	11,823,000
Total equity	819,172,000	786,746,000
Total liabilities and equity	2,183,333,000	2,121,556,000
Variable Interest Entity, Primary Beneficiary [Member]
Receivables:
Property, plant and equipment, net ($1,421,996 and $1,339,342 related to VIEs, respectively)	1,421,996,000	1,339,342,000
Construction-in-process ($82,045 and $162,006 related to VIEs, respectively)	$ 82,045,000	$ 162,006,000