Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
Electricity	$ 89,953us-gaap_ElectricUtilityRevenue	$ 94,817us-gaap_ElectricUtilityRevenue
Product	30,278us-gaap_SalesRevenueGoodsNet	47,619us-gaap_SalesRevenueGoodsNet
Total revenues	120,231us-gaap_SalesRevenueNet	142,436us-gaap_SalesRevenueNet
Cost of revenues:
Electricity	55,581us-gaap_CostOfGoodsSoldElectric	57,034us-gaap_CostOfGoodsSoldElectric
Product	20,625us-gaap_CostOfGoodsSold	31,943us-gaap_CostOfGoodsSold
Total cost of revenues	76,206us-gaap_CostOfGoodsAndServicesSold	88,977us-gaap_CostOfGoodsAndServicesSold
Gross margin	44,025us-gaap_GrossProfit	53,459us-gaap_GrossProfit
Operating expenses:
Research and development expenses	363us-gaap_ResearchAndDevelopmentExpense	(87)us-gaap_ResearchAndDevelopmentExpense
Selling and marketing expenses	3,433us-gaap_SellingAndMarketingExpense	3,379us-gaap_SellingAndMarketingExpense
General and administrative expenses	10,204us-gaap_GeneralAndAdministrativeExpense	7,596us-gaap_GeneralAndAdministrativeExpense
Write-off of unsuccessful exploration activities	174
Operating income	29,851us-gaap_OperatingIncomeLoss	42,571us-gaap_OperatingIncomeLoss
Other income (expense):
Interest income	9us-gaap_InvestmentIncomeInterest	111us-gaap_InvestmentIncomeInterest
Interest expense, net	(17,828)us-gaap_InterestExpense	(20,518)us-gaap_InterestExpense
Foreign currency translation and transaction losses	(1,366)	(638)
Income attributable to sale of tax benefits	5,552	6,717
Other non-operating income, net	283us-gaap_OtherNonoperatingIncomeExpense	63us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes and equity in losses of investees	16,501	28,306
Income tax provision	(5,459)us-gaap_IncomeTaxExpenseBenefit	(6,320)us-gaap_IncomeTaxExpenseBenefit
Equity in losses of investees, net	(775)	(197)
Net income	10,267us-gaap_ProfitLoss	21,789us-gaap_ProfitLoss
Net loss attributable to noncontrolling interest	(235)	(237)
Net income attributable to the Company's stockholders	10,032us-gaap_NetIncomeLoss	21,552us-gaap_NetIncomeLoss
Comprehensive income:
Net income (in Dollars per share)	$ 10,267us-gaap_EarningsPerShareBasic	$ 21,789us-gaap_EarningsPerShareBasic
Other comprehensive income (loss), net of related taxes:
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment	(3,296)
Loss in respect of derivative instruments designated for cash flow hedge	23
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge	(30)	(36)
Comprehensive income	6,964	21,753
Comprehensive loss attributable to noncontrolling interest	(235)	(237)
Comprehensive income attributable to the Company's stockholders	$ 6,729us-gaap_ComprehensiveIncomeNetOfTax	$ 21,516us-gaap_ComprehensiveIncomeNetOfTax
Earnings per share attributable to the Company's stockholders - basic and diluted
Net income (in Dollars per share)	$ 0.21us-gaap_EarningsPerShareBasicAndDiluted	$ 0.47us-gaap_EarningsPerShareBasicAndDiluted
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:
Basic (in Shares)	47,244	45,479
Diluted (in Shares)	48,079	45,660
Dividend per share declared (in Dollars per share)	$ 0.08	$ 0.06

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