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WARRANTIES (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Changes in product warranty accrual    
Balance at the beginning of period $ 3,556 $ 3,802
Warranties issued 372 373
Warranty settlement costs (373) (590)
Changes in accruals for pre-existing warranties (345) 2
Currency translation adjustments 56 (66)
Balance at the end of period $ 3,266 $ 3,521