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PRODUCT WARRANTY COSTS (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Changes in the carrying amount of product warranty accruals    
Balance at beginning of year $ 19,469 $ 15,579
Accruals for warranties 6,444 7,327
Settlements (6,178) (6,796)
Foreign currency translation 107 (229)
Balance at end of year $ 19,842 $ 15,881