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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
COMMITMENTS AND CONTINGENCIES [Abstract]    
Rent expense charged to operations $ 2,388 $ 2,496
Future minimum rental payments required under all non-cancelable operating leases [Abstract]    
October 1, 2018 to December 31, 2018 761  
2019 3,164  
2020 2,782  
2021 2,354  
2022 1,624  
2023 1,179  
Thereafter 5,647  
Total minimum lease payments $ 17,511