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PRODUCT WARRANTY COSTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Changes in the carrying amount of product warranty accruals      
Balance at beginning of year $ 15,579 $ 15,180 $ 15,304
Accruals for warranties 19,824 12,368 12,786
Settlements (15,458) (11,495) (12,794)
Foreign currency translation (476) (474) (116)
Balance at end of year $ 19,469 $ 15,579 $ 15,180