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WARRANTIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Changes in product warranty accrual    
Balance at the beginning of period $ 3,802 $ 3,891
Warranties issued 2,117 2,863
Warranty settlement costs (2,329) (2,741)
Changes in accruals for pre-existing warranties 68 (157)
Currency translation adjustments (102) (54)
Balance at the end of period $ 3,556 $ 3,802