SEGMENT INFORMATION (Schedule of Reportable Segments and Operating Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 338,095	$ 410,556	$ 1,101,164	$ 1,007,437
Cost of revenues	230,032	271,247	750,130	671,348
Gross profit	108,063	139,309	351,034	336,089
Research and development	40,817	30,747	115,610	86,451
Sales and marketing	21,924	22,026	67,113	64,325
General and administrative	14,928	12,214	45,077	37,590
Segments profit (loss)	43,751	41,724	122,667	92,612
Solar segment profit	56,671	89,548	199,231	200,590
All other segment loss	(6,627)	(329)	(23,857)	(9,130)
Segments operating profit	50,044	89,219	175,374	191,460
Amounts not allocated to segments:
Stock based compensation expenses	(16,259)	(11,367)	(42,993)	(32,443)
Amortization	(2,833)	(3,409)	(8,169)	(8,671)
Legal settlement (see Note 11)			4,900
Cost of products adjustments		(107)	(313)	(1,108)
Other unallocated expenses	(558)	(14)	(558)	(1,515)
Non recurring expenses		(8,305)		(8,305)
Adjustments:
Intersegment profit			(107)
Consolidated operating income	30,394	66,017	128,134	139,418
Solar [Member]
Segment Reporting Information [Line Items]
Revenues	312,480	387,772	1,030,175	947,586
Cost of revenues	203,590	250,493	673,751	610,335
Gross profit	108,890	137,279	356,424	337,251
Research and development	26,466	23,707	79,923	66,219
Sales and marketing	15,160	16,551	48,803	48,900
General and administrative	10,593	7,473	28,467	21,542
Segments profit (loss)	56,671	89,548	199,231	200,590
All Other [Member]
Segment Reporting Information [Line Items]
Revenues	25,615	22,784	71,476	59,851
Cost of revenues	21,283	16,058	61,974	47,927
Gross profit	4,332	6,726	9,502	11,924
Research and development	7,421	2,754	17,481	8,235
Sales and marketing	2,328	2,256	6,650	6,273
General and administrative	1,210	2,045	9,228	6,546
Segments profit (loss)	$ (6,627)	$ (329)	$ (23,857)	$ (9,130)