Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2012 Revised [Member]
Revenues:
Electricity	$ 329,747	$ 312,296	$ 314,894
Product	203,492	113,160	186,879
Total revenues	533,239	425,456	501,773
Cost of revenues:
Electricity	232,874	235,609	237,415
Product	140,547	76,072	135,346
Total cost of revenues	373,421	311,681	372,761
Gross margin	159,818	113,775	129,012
Operating expenses:
Research and development expenses	4,965	8,801	6,108
Selling and marketing expenses	24,613	16,053	15,718
General and administrative expenses	29,188	27,366	28,066
Impairment charges			236,377
Write-off of unsuccessful exploration activities	4,094		2,639
Operating income (loss)	96,958	61,555	(159,896)
Other income (expense):
Interest income	1,332	1,427	1,201
Interest expense, net	(73,776)	(69,459)	(64,069)
Foreign currency translation and transaction gains (losses)	5,085	(1,350)	242
Income attributable to sale of tax benefits	19,945	11,474	10,127
Other non-operating income, net	1,592	671	590
Income (loss) from continuing operations, before income taxes and equity in losses of investees	51,136	4,318	(211,805)
Income tax provision	(13,552)	(48,240)	(1,827)
Equity in losses of investees, net	(250)	(959)	(2,522)
Income (loss) from continuing operations	37,334	(44,881)	(216,154)
Discontinued operations:
Income from discontinued operations (including gain on disposal of $3,646, $0 and $0, respectively)	5,311	2,452	4,811
Total income from discontinued operations	4,697	2,157	3,547
Net income (loss)	42,031	(42,724)	(212,607)
Net income attributable to noncontrolling interest	(793)	(332)	(414)
Net income (loss) attributable to the Company's stockholders	41,238	(43,056)	(213,021)
Comprehensive income (loss):
Net income (loss)	42,031	(42,724)	(212,607)
Other comprehensive income (loss), net of related taxes:
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge	(164)	(212)	(190)
Change in unrealized gains or losses on marketable securities available-for-sale		(237)	246
Comprehensive income (loss)	41,867	(43,173)	(212,551)
Comprehensive income attributable to noncontrolling interest	(793)	(332)	(414)
Comprehensive income (loss) attributable to the Company's stockholders	$ 41,074	$ (43,505)	$ (212,965)
Basic:
Income (loss) from continuing operations (in Dollars per share)	$ 0.81	$ (1.00)	$ (4.77)
Discontinued operations (in Dollars per share)	$ 0.10	$ 0.05	$ 0.08
Net income (loss) (in Dollars per share)	$ 0.91	$ (0.95)	$ (4.69)
Diluted:
Income (loss) from continuing operations (in Dollars per share)	$ 0.81	$ (1.00)	$ (4.77)
Discontinued operations (in Dollars per share)	$ 0.10	$ 0.05	$ 0.08
Net income (loss) (in Dollars per share)	$ 0.91	$ (0.95)	$ (4.69)
Weighted average number of shares used in computation of earnings (loss) per share attributable to the Company's stockholders:
Basic (in Shares)	45,440	45,431	45,431
Diluted (in Shares)	45,475	45,431	45,431
Dividend per share declared (in Dollars per share)	$ 0.08	$ 0.13	$ 0.08