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WARRANTIES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Changes in product warranty accrual        
Balance at the beginning of period $ 3,864 $ 3,251 $ 3,891 $ 3,449
Warranties issued 430 613 1,399 1,212
Warranty settlement costs (446) (512) (1,448) (1,132)
Changes in accruals for pre-existing warranties 88 (105) 75 (284)
Currency translation adjustments 101 10 120 12
Balance at the end of period $ 4,037 $ 3,257 $ 4,037 $ 3,257