Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Revenue	$ 174,900	$ 184,065	$ 367,013	$ 383,103
Cost of revenues:
Cost of revenues	109,514	118,918	219,809	243,777
Gross profit	65,386	65,147	147,204	139,326
Operating expenses:
Research and development expenses	1,172	810	2,791	1,710
Selling and marketing expenses	4,854	3,276	9,648	7,141
General and administrative expenses	11,285	14,181	25,633	29,870
Operating income	48,075	46,880	109,132	100,605
Other income (expense):
Interest income	441	420	843	713
Interest expense, net	(19,785)	(21,517)	(37,058)	(42,740)
Derivatives and foreign currency transaction gains (losses)	671	19	1,064	491
Income attributable to sale of tax benefits	5,672	4,637	9,804	12,401
Other non-operating income (expense), net	304	1,027	382	1,118
Income from operations before income tax and equity in earnings (losses) of investees	35,378	31,466	84,167	72,588
Income tax (provision) benefit	(11,766)	3,529	(29,914)	(10,510)
Equity in earnings (losses) of investees, net	1,658	1,202	923	2,249
Net income	25,270	36,197	55,176	64,327
Net income attributable to noncontrolling interest	(2,224)	(2,259)	(6,097)	(4,443)
Net income attributable to the Company's stockholders	23,046	33,938	49,079	59,884
Comprehensive income:
Net income	25,270	36,197	55,176	64,327
Other comprehensive income (loss), net of related taxes:
Change in foreign currency translation adjustments	921	482	276	(866)
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment	(653)	(2,087)	(5,408)	(3,232)
Change in respect of derivative instruments designated for cash flow hedge	17	18	30	40
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge	(5)	(9)	(13)	(17)
Comprehensive income	25,550	34,601	50,061	60,252
Comprehensive income attributable to noncontrolling interest	(2,763)	(2,443)	(6,249)	(4,305)
Comprehensive income attributable to the Company's stockholders	$ 22,787	$ 32,158	$ 43,812	$ 55,947
Basic:
Net income (in dollars per share)	$ 0.45	$ 0.67	$ 0.96	$ 1.18
Diluted:
Net income (in dollars per share)	$ 0.45	$ 0.66	$ 0.95	$ 1.17
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:
Basic (in shares)	51,043	50,800	51,040	50,757
Diluted (in shares)	51,362	51,094	51,448	51,058
Electricity [Member]
Revenues:
Revenue	$ 128,685	$ 129,079	$ 271,541	$ 271,987
Cost of revenues:
Cost of revenues	71,950	73,775	143,318	151,318
Product [Member]
Revenues:
Revenue	43,701	52,030	91,112	104,158
Cost of revenues:
Cost of revenues	34,709	41,316	71,687	83,422
Energy Storage and Management Services [Member]
Revenues:
Revenue	2,514	2,956	4,360	6,958
Cost of revenues:
Cost of revenues	$ 2,855	$ 3,827	$ 4,804	$ 9,037