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DEBT - Revolving Credit Agreement (Details)
3 Months Ended
Dec. 21, 2018
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]        
Long-term debt, gross   $ 453,835,000   $ 453,835,000
Interest expense   6,150,000 $ 6,272,000  
Repayments of lines of credit   114,000 40,000  
Revolving Credit Agreement        
Debt Instrument [Line Items]        
Line of credit facility, 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 1.0      
Line of credit facility, excess availability, commitment percentage, threshold 10.00%      
Long-term debt, gross   0 45,000,000.0  
Interest expense   0 100,000  
Proceeds from issuance of long-term debt     45,000,000.0  
Repayments of lines of credit     $ 45,000,000.0  
Liquidity position to meet future obligations, amount   $ 337,300,000   $ 384,000,000.0
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%      
Letter of Credit | Revolving Credit Agreement        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 15,000,000      
Bridge Loan | Revolving Credit Agreement        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 17,500,000