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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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