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WARRANTY OBLIGATIONS - Summary of Warranty Activities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Changes in the Company's product warranty liability |  |  |
Warranty obligations, beginning of period | $ 45,913 | $ 37,098 | $ 31,294
Accruals for warranties issued during period | 18,098 | 7,021 | 5,244
Changes in estimates | 19,414 | 9,954 | 8,591
Settlements | (15,073) | (12,811) | (10,881)
Increase due to accretion expense | 4,654 | 3,255 | 2,326
Other | 371 | 1,396 | 524
Warranty obligations, end of period | 73,377 | 45,913 | 37,098
Less: current portion | (19,395) | (11,260) | (10,078)
Non-current | $ 53,982 | $ 34,653 | $ 27,020

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