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WARRANTY OBLIGATIONS - Summary of Warranty Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Changes in the Company's product warranty liability
Warranty obligations, beginning of period	$ 54,553	$ 37,501	$ 45,913	$ 37,098
Accruals for warranties issued during period	3,319	766	7,213	2,290
Changes in estimates	4,269	1,748	11,924	3,425
Settlements	(2,757)	(2,578)	(5,687)	(5,848)
Increase due to accretion expense	1,104	804	2,047	1,578
Other	(550)	(334)	(1,472)	(636)
Warranty obligations, end of period	59,938	37,907	59,938	37,907
Less: current portion	(15,009)	(10,170)	(15,009)	(10,170)	$ (11,260)
Noncurrent	$ 44,929	$ 27,737	$ 44,929	$ 27,737	$ 34,653

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