WARRANTY OBLIGATIONS - Summary of Warranty Activities (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Changes in the Company's product warranty liability
Warranty obligations, beginning of period	$ 37,098	$ 31,294
Accruals for warranties issued during period	1,524	858
Changes in estimates	1,677	804
Settlements	(3,270)	(2,296)
Increase due to accretion expense	774	551
Other	(302)	(169)
Warranty obligations, end of period	37,501	31,042
Less: current portion	(9,678)	(7,925)	$ (10,078)
Noncurrent	$ 27,823	$ 23,117	$ 27,020

Product Warranty Accrual, Accretion Expense

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Standard And Extended Product Warranty Accrual, Other Period Increase (Decrease)

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.

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Amount of increase (decrease) in the standard and extended product warranty accrual from changes in estimates attributable to preexisting product warranties.

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Amount of decrease in the standard product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard product warranty. Excludes extended product warranties.

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