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WARRANTY OBLIGATIONS - Summary of Warranty Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Changes in the Company's product warranty liability |  |  |  |  |
Warranty obligations, beginning of period | $ 83,579 | $ 54,553 | $ 73,377 | $ 45,913 |
Accruals for warranties issued during period | 11,311 | 3,319 | 20,221 | 7,213 |
Changes in estimates | 17,063 | 4,269 | 21,975 | 11,924 |
Settlements | (6,590) | (2,757) | (12,471) | (5,687) |
Increase due to accretion expense | 1,828 | 1,104 | 3,343 | 2,047 |
Other | (10,641) | (550) | (9,895) | (1,472) |
Warranty obligations, end of period | 96,551 | 59,938 | 96,551 | 59,938 |
Less: current portion | (29,197) | (15,009) | (29,197) | (15,009) | $ (19,395)
Non-current | $ 67,354 | $ 44,929 | $ 67,354 | $ 44,929 | $ 53,982

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