Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Revenue	$ 158,947	$ 170,499	$ 525,960	$ 553,602
Cost of revenues:
Cost of revenues	104,917	115,004	324,726	358,781
Gross profit	54,030	55,495	201,234	194,821
Operating expenses:
Research and development expenses	1,490	1,062	4,281	2,772
Selling and marketing expenses	4,076	3,783	13,724	10,924
General and administrative expenses	14,539	11,931	43,154	41,801
Business interruption insurance income	(17,761)	0	(20,743)	0
Operating income	51,686	38,719	160,818	139,324
Other income (expense):
Interest income	626	482	1,469	1,195
Interest expense, net	(21,756)	(20,076)	(58,814)	(62,816)
Derivatives and foreign currency transaction gains (losses)	1,047	205	2,111	696
Income attributable to sale of tax benefits	7,014	4,056	16,818	16,457
Other non-operating income (expense), net	961	244	1,343	1,362
Income from operations before income tax and equity in earnings (losses) of investees	39,578	23,630	123,745	96,218
Income tax (provision) benefit	(15,361)	(9,626)	(45,275)	(20,136)
Equity in earnings (losses) of investees, net	(1,119)	1,085	(196)	3,334
Net income	23,098	15,089	78,274	79,416
Net income attributable to noncontrolling interest	(7,419)	516	(13,516)	(3,927)
Net income attributable to the Company's stockholders	15,679	15,605	64,758	75,489
Comprehensive income:
Net income	23,098	15,089	78,274	79,416
Other comprehensive income (loss), net of related taxes:
Change in foreign currency translation adjustments	1,321	(2,191)	1,597	(3,057)
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment	947	(1,467)	(4,461)	(4,699)
Change in unrealized gains or losses in respect of a cross currency swap derivative instrument that qualifies as a cash flow hedge	36	18
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge	(6)	(7)	(19)	(24)
Comprehensive income	21,848	11,442	71,909	71,694
Comprehensive income attributable to noncontrolling interest	(7,751)	1,051	(14,000)	(3,254)
Comprehensive income attributable to the Company's stockholders	$ 14,097	$ 12,493	$ 57,909	$ 68,440
Basic:
Net income (in dollars per share)	$ 0.31	$ 0.31	$ 1.27	$ 1.49
Diluted:
Net income (in dollars per share)	$ 0.31	$ 0.30	$ 1.26	$ 1.48
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:
Basic (in shares)	51,072	50,933	51,051	50,816
Diluted (in shares)	51,282	51,334	51,386	51,124
Cross Currency Interest Rate Contract [Member]
Other comprehensive income (loss), net of related taxes:
Change in unrealized gains or losses in respect of a cross currency swap derivative instrument that qualifies as a cash flow hedge	$ (3,548)	$ 0	$ (3,548)	$ 0
Other Contract [Member]
Other comprehensive income (loss), net of related taxes:
Change in unrealized gains or losses in respect of a cross currency swap derivative instrument that qualifies as a cash flow hedge	36	18	66	58
Electricity [Member]
Revenues:
Revenue	123,660	123,978	395,201	395,965
Cost of revenues:
Cost of revenues	76,670	80,124	219,988	231,442
Product [Member]
Revenues:
Revenue	29,625	43,037	120,737	147,195
Cost of revenues:
Cost of revenues	24,037	31,073	95,724	114,495
Energy Storage and Management Services [Member]
Revenues:
Revenue	5,662	3,484	10,022	10,442
Cost of revenues:
Cost of revenues	$ 4,210	$ 3,807	$ 9,014	$ 12,844