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PRODUCT WARRANTY COSTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Changes in the carrying amount of product warranty accruals      
Balance at beginning of year $ 19,469 $ 15,579 $ 15,180
Accruals for warranties 13,058 19,824 12,368
Settlements (11,434) (15,458) (11,495)
Foreign currency translation (40) (476) (474)
Balance at end of year $ 21,053 $ 19,469 $ 15,579