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CONTINGENT LIABILITIES AND COMMITMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Changes in warranty reserve        
Balance, December 31, 2017     $ 9,174  
Provision for warranty claims $ 1,600 $ 1,700 5,457 $ 4,600
Warranties claims paid     (5,668)  
Warranties acquired through business combinations     611  
Foreign currency translation adjustment     24  
Balance, September 30, 2018 $ 9,598   $ 9,598