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WARRANTIES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Changes in product warranty accrual        
Balance at the beginning of period $ 3,824 $ 4,037 $ 3,802 $ 3,891
Warranties issued 568 682 1,649 2,081
Warranty settlement costs (533) (620) (1,680) (2,068)
Changes in accruals for pre-existing warranties (141) (11) (77) 64
Currency translation adjustments 14 (109) 38 11
Balance at the end of period $ 3,732 $ 3,979 $ 3,732 $ 3,979