Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Electricity	$ 97,245	$ 102,506	$ 278,124	$ 289,015
Product	65,607	37,736	145,446	121,266
Total revenue	162,852	140,242	423,570	410,281
Cost of revenues:
Electricity	61,501	61,727	179,604	186,083
Product	42,019	23,040	89,826	75,307
Total cost of revenue	103,520	84,767	269,430	261,390
Gross margin	59,332	55,475	154,140	148,891
Operating expenses:
Research and development expenses	335	250	1,112	395
Selling and marketing expenses	4,383	4,258	12,099	10,853
General and administrative expenses	7,950	7,179	25,597	20,847
Write-off of unsuccessful exploration activities	185		359	8,107
Operating income	46,479	43,788	114,973	108,689
Other income (expense):
Interest income	53	35	106	236
Interest expense, net	(17,748)	(22,494)	(54,435)	(65,084)
Foreign currency translation and transaction gains (losses)	1,296	(2,946)	(641)	(3,639)
Income attributable to sale of tax benefits	8,634	5,487	18,917	18,334
Gain from sale of property, plant and equipment			(531)	7,628
Other non-operating income (expense), net	(131)	243	(1,523)	649
Income before income taxes and equity in losses of investees	38,583	24,113	77,397	66,813
Income tax (provision) benefit	38,211	(6,444)	26,696	(17,731)
Equity in losses of investees, net	(3,133)	(899)	(4,892)	(1,210)
Net income	73,661	16,770	99,201	47,872
Net income attributable to noncontrolling interest	(1,522)	(256)	(2,616)	(670)
Net income attributable to the Company's stockholders	72,139	16,514	96,585	47,202
Comprehensive income:
Net income	73,661	16,770	99,201	47,872
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	(4,318)	(1,069)	(4,154)	(5,157)
Loss in respect of derivative instruments designated for cash flow hedge	22	(933)	68	(933)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge	(29)	(35)	(90)	(107)
Comprehensive income	69,336	14,733	95,025	41,675
Comprehensive income attributable to noncontrolling interest	(1,522)	(256)	(2,616)	(670)
Comprehensive income attributable to the Company's stockholders	$ 67,814	$ 14,477	$ 92,409	$ 41,005
Basic:
Net income (in Dollars per share)	$ 1.47	$ 0.36	$ 2.00	$ 1.04
Diluted:
Net income (in Dollars per share)	$ 1.41	$ 0.36	$ 1.93	$ 1.03
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:
Basic (in Shares)	49,023	45,690	48,388	45,594
Diluted (in Shares)	51,113	46,102	50,011	45,917
Dividend per share declared (in Dollars per share)	$ 0.06	$ 0.05	$ 0.20	$ 0.16