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WARRANTY OBLIGATIONS - Summary of Warranty Activities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Changes in the Company's product warranty liability
Warranty obligations, beginning of period	$ 59,938	$ 37,907	$ 45,913	$ 37,098
Accruals for warranties issued during period	4,780	1,939	11,993	4,229
Changes in estimates	3,593	3,869	15,517	7,294
Settlements	(4,141)	(3,274)	(9,828)	(9,122)
Increase due to accretion expense	1,260	832	3,307	2,410
Other	2,082	2,506	610	1,870
Warranty obligations, end of period	67,512	43,779	67,512	43,779
Less: current portion	(16,728)	(10,760)	(16,728)	(10,760)	$ (11,260)
Noncurrent	$ 50,784	$ 33,019	$ 50,784	$ 33,019	$ 34,653

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