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ACCRUED WARRANTY COSTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
ACCRUED WARRANTY COSTS      
Beginning balance $ 55,878 $ 50,605 $ 55,659
Warranty provision 26,931 28,044 13,188
Warranty costs incurred (46,067) (23,282) (16,732)
Foreign exchange effect 990 511 (1,510)
Ending balance $ 37,732 $ 55,878 $ 50,605