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WARRANTY OBLIGATIONS - Summary of Warranty Activities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Changes in the Company's product warranty liability |  |  |
Warranty obligations, beginning of period | $ 45,913 | $ 37,098 |
Accruals for warranties issued during period | 3,894 | 1,524 |
Changes in estimates | 7,655 | 1,677 |
Settlements | (2,930) | (3,270) |
Increase due to accretion expense | 943 | 774 |
Other | (922) | (302) |
Warranty obligations, end of period | 54,553 | 37,501 |
Less: current portion | (14,303) | (9,678) | $ (11,260)
Noncurrent | $ 40,250 | $ 27,823 | $ 34,653

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