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CONTINGENT LIABILITIES AND COMMITMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Changes in warranty reserve        
Balance, December 31, 2018     $ 9,600  
Provision for warranty claims $ 2,700 $ 1,900 4,600 $ 3,800
Warranty claims settled     (4,000)  
Foreign currency translation adjustment     (100)  
Balance, June 30, 2019 $ 10,100   $ 10,100