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ACCRUED WARRANTY COSTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
ACCRUED WARRANTY COSTS      
Beginning balance $ 54,644 $ 40,605 $ 58,334
Warranty provision 15,876 18,570 (16,465)
Warranty costs incurred (3,872) (2,996) (951)
Foreign exchange effect (1,455) (1,535) (313)
Ending balance $ 65,193 $ 54,644 $ 40,605