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LEASES - ASC 840 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Future minimum operating lease commitments      
2019 $ 3,954    
2020 2,949    
2021 2,410    
2022 2,114    
2023 1,681    
2024 and thereafter 14,860    
Total 27,968    
Rent expense under operating leases $ 6,100 $ 10,700  
Additional operating leases     $ 700