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ACQUISITION, INTEGRATION AND RESTRUCTURING EXPENSE - Restructuring Reserve (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance $ 23 $ 0  
Additions 20 1,268 $ 0
Payments (43) (1,245)  
Restructuring reserve, ending balance 0 23 0
Delaware Restructuring      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 23 0  
Additions 20 843  
Payments (43) (820)  
Restructuring reserve, ending balance 0 23 0
Rhode Island Restructuring      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 0 0  
Additions 0 425  
Payments 0 (425)  
Restructuring reserve, ending balance $ 0 $ 0 $ 0