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PRODUCT WARRANTY COSTS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Changes in the carrying amount of product warranty accruals    
Balance at beginning of year $ 21,053 $ 19,469
Accruals for warranties 2,553 3,035
Settlements (2,848) (3,063)
Foreign currency translation 103 147
Balance at end of year $ 20,861 $ 19,588