Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Electricity	$ 94,817,000
Product	47,619,000
Total revenues	142,436,000	118,906,000
Cost of revenues:
Electricity	57,034,000
Product	31,943,000
Total cost of revenues	88,977,000
Gross margin	53,459,000
Operating expenses:
Research and development expenses, net	(87,000)
Selling and marketing expenses	3,379,000
General and administrative expenses	7,596,000
Operating income	42,571,000	7,684,000
Other income (expense):
Interest income	111,000	41,000
Interest expense, net	(20,518,000)	(15,863,000)
Foreign currency translation and transaction gains (losses)	(638,000)	1,682,000
Income attributable to sale of tax benefits	6,717,000	3,532,000
Other non-operating income, net	63,000	1,417,000
Income (loss) before income taxes and equity in losses of investees	28,306,000	(1,507,000)
Income tax provision	(6,320,000)	4,269,000
Equity in losses of investees	(197,000)
Income (loss) from continuing operations	21,789,000	(4,949,000)
Discontinued operations:
Net income (loss)	21,789,000	(4,949,000)
Net income attributable to noncontrolling interest	(237,000)
Net income (loss) attributable to the Company's stockholders	21,552,000	(5,034,000)
Comprehensive income (loss):
Net income (loss)	21,789,000	(4,949,000)
Other comprehensive income (loss), net of related taxes:
Amortization of gains in respect of derivative instruments designated for cash flow hedge	(36,000)	(42,000)
Comprehensive income (loss)	21,753,000	(4,991,000)
Comprehensive income attributable to noncontrolling interest	(237,000)
Comprehensive income (loss) attributable to the Company's stockholders	21,516,000	(5,076,000)
Earnings (loss) per share attributable to the Company's stockholders - basic and diluted:
Income (loss) from continuing operations: (in Dollars per share)	$ 0.47
Net income (loss): (in Dollars per share)	$ 0.47
Weighted average number of shares used in computation of earnings (loss) per share attributable to the Company's stockholders:
Basic (in Shares)	45,479	45,431
Diluted (in Shares)	45,660	45,431
Revised [Member] | Discontinued Operations [Member]
Other income (expense):
Income tax provision		(222,000)
Revised [Member]
Revenues:
Electricity		68,298,000
Product		50,608,000
Total revenues		118,906,000
Cost of revenues:
Electricity		55,088,000
Product		37,041,000
Total cost of revenues		92,129,000
Gross margin		26,777,000
Operating expenses:
Research and development expenses, net		1,000,000
Selling and marketing expenses		11,509,000
General and administrative expenses		6,584,000
Operating income		7,684,000
Other income (expense):
Interest income		41,000
Interest expense, net		(15,863,000)
Foreign currency translation and transaction gains (losses)		1,682,000
Income attributable to sale of tax benefits		3,532,000
Other non-operating income, net		1,417,000
Income (loss) before income taxes and equity in losses of investees		(1,507,000)
Income tax provision		(4,047,000)
Income (loss) from continuing operations		(5,554,000)
Discontinued operations:
Income from discontinued operations		827,000
Total income from discontinued operations		605,000
Net income (loss)		(4,949,000)
Net income attributable to noncontrolling interest		(85,000)
Net income (loss) attributable to the Company's stockholders		(5,034,000)
Comprehensive income (loss):
Net income (loss)		(4,949,000)
Other comprehensive income (loss), net of related taxes:
Amortization of gains in respect of derivative instruments designated for cash flow hedge		(42,000)
Comprehensive income (loss)		(4,991,000)
Comprehensive income attributable to noncontrolling interest		(85,000)
Comprehensive income (loss) attributable to the Company's stockholders		$ (5,076,000)
Earnings (loss) per share attributable to the Company's stockholders - basic and diluted:
Income (loss) from continuing operations: (in Dollars per share)		$ (0.12)
Discontinued operations: (in Dollars per share)		$ 0.01
Net income (loss): (in Dollars per share)		$ (0.11)
Weighted average number of shares used in computation of earnings (loss) per share attributable to the Company's stockholders:
Basic (in Shares)		45,431
Diluted (in Shares)		45,431