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LONG-TERM DEBT - Revolving Credit Agreement Narrative (Details)
12 Months Ended
Dec. 21, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2020
USD ($)
Debt Instrument [Line Items]          
Loss on debt extinguishment   $ 396,000 $ 165,000 $ 280,000  
Interest expense   $ 24,194,000 27,340,000 28,759,000  
Revolving Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 175,000,000        
Line of credit facility accordion feature increase limit $ 275,000,000        
Line of credit facility, unused capacity, commitment fee percentage 0.20%        
Fixed charge coverage ratio minimum 1.0        
Line of credit facility, excess availability, commitment percentage 10.00%        
Debt instrument, covenant period   30 days      
Loss on debt extinguishment       100,000  
Liquidity position to meet future obligations, amount   $ 384,000,000.0 308,100,000    
Long-term line of credit   45,000,000.0 45,000,000.0    
Long-term debt         $ 45,000,000.0
Revolving Credit Agreement | Maximum          
Debt Instrument [Line Items]          
Line of credit facility, excess availability applied to principal, commitment percentage 15.00%        
Revolving Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 1.25%        
Revolving Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 1.75%        
Revolving Credit Agreement | Base Rate | Minimum          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 0.25%        
Revolving Credit Agreement | Base Rate | Maximum          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 0.75%        
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Long-term debt   0 0    
Interest expense   $ 200,000 $ 0 $ 0  
Letter of Credit | Revolving Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 15,000,000        
Bridge Loan | Revolving Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 17,500,000