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INDEBTEDNESS - Credit facility (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Current debt $ 15,182   $ 13,243
Borrowing repayment $ 0 $ 7,500  
Senior Secured Credit Facility [Member]      
Debt Instrument, Term 5 years    
Line of Credit Facility, Commitment Fee Percentage 0.40%    
Senior Secured Credit Facility [Member] | LIBOR [Member]      
Debt Instrument, Basis Spread on Variable Rate 2.00%    
Senior Secured Credit Facility [Member] | LIBOR [Member] | Minimum      
Debt Instrument, Basis Spread on Variable Rate 1.50%    
Senior Secured Credit Facility [Member] | LIBOR [Member] | Maximum      
Debt Instrument, Basis Spread on Variable Rate 2.75%    
Senior Secured Credit Facility [Member] | Alternative Base Rate [Member] | Minimum      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
Senior Secured Credit Facility [Member] | Alternative Base Rate [Member] | Maximum      
Debt Instrument, Basis Spread on Variable Rate 1.75%    
Senior Secured Credit Facility [Member] | Term Loan [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 72,200    
Quarterly payment 6,800    
Current debt 6,800    
Senior Secured Credit Facility [Member] | Delayed Draw Term Loan [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 118,000    
Quarterly payment 8,900    
Current debt 8,900    
Senior Secured Credit Facility [Member] | Revolver [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 75,000    
Amount borrowed 31,500    
Line of Credit Facility, Remaining Borrowing Capacity $ 43,500    
Senior Secured Credit Facility [Member] | Revolver [Member] | Minimum      
Line of Credit Facility, Commitment Fee Percentage 0.25%    
Senior Secured Credit Facility [Member] | Revolver [Member] | Maximum      
Line of Credit Facility, Commitment Fee Percentage 0.50%