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LEASES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
LEASES [Abstract]      
Rental expense $ 9,000 $ 7,300 $ 5,800
Future minimum rental commitments [Abstract]      
2019 8,452    
2020 7,262    
2021 5,673    
2022 4,411    
2023 2,621    
Thereafter 10,390    
Total $ 38,809