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CREDIT FACILITY AND ACQUISITION DEBT (Long-term Debt Table) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]            
Accumulated Amortization, Debt Issuance Costs $ 1,242,000     $ 1,242,000   $ 819,000
Current maturities on long-term debt (730,000)     (730,000)   (1,027,000)
Long-term debt, excluding current maturities 4,359,000     4,359,000   4,482,000
Revolving credit facility present accordion provisions 75,000,000     75,000,000    
Credit Facility amortization of debt issuance costs       459,000 $ 592,000  
Gain (Loss) on Extinguishment of Debt 0   $ (6,000) (23,807,000) (6,000)  
Credit Agreement 2018 [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Long-term Debt 86,900,000     86,900,000   47,200,000
Credit Facility amortization of debt issuance costs   $ 80,000 $ 118,000 297,000 $ 363,000  
Credit Agreement [Member]            
Debt Instrument [Line Items]            
Gain (Loss) on Extinguishment of Debt       100,000    
Credit Agreement [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Debt issuance costs           (1,136,000)
Credit Agreement [Member] | Term Loan [Member]            
Debt Instrument [Line Items]            
Long-term Debt 85,418,000     85,418,000   46,064,000
Notes Payable, Other Payables [Member] | Acquisition Debt, Deferred Purchase Price [Member]            
Debt Instrument [Line Items]            
Long-term Debt 5,089,000     5,089,000   5,509,000
Revolving Credit Facility [Member] | Credit Agreement [Member]            
Debt Instrument [Line Items]            
Debt issuance costs (1,482,000)     (1,482,000)    
Term Loan [Member]            
Debt Instrument [Line Items]            
Revolving credit facility, maximum borrowing capacity           190,000,000
New Term Loan            
Debt Instrument [Line Items]            
Revolving credit facility, maximum borrowing capacity $ 150,000,000     $ 150,000,000    
Letter of Credit [Member]            
Debt Instrument [Line Items]            
Revolving credit facility, maximum borrowing capacity           15.0
Swingline [Member]            
Debt Instrument [Line Items]            
Revolving credit facility, maximum borrowing capacity           $ 10.0