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DEBT - Revolving Credit (Details)
3 Months Ended 9 Months Ended
Dec. 21, 2018
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]              
Fixed charge coverage ratio 1.0            
Long-term debt, gross   $ 465,000,000     $ 465,000,000   $ 460,228,000
Interest expense   5,749,000   $ 6,713,000 17,903,000 $ 20,823,000  
Liquidity position to meet future obligations, amount   $ 383,400,000     $ 383,400,000   $ 308,100,000
Increase (decrease), liquidity position to meet future obligations, percentage   24.00%     24.00%    
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, excess availability, commitment percentage, threshold 10.00%            
Proceeds from issuance of long-term debt     $ 45,000,000.0        
Long-term debt, gross   $ 45,000,000.0     $ 45,000,000.0    
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%            
Revolving Credit Facility              
Debt Instrument [Line Items]              
Line of credit facility, unused capacity, commitment fee percentage 0.20%            
Long-term debt, gross   0   0 0 0  
Interest expense   $ 0   $ 0 $ 200,000 $ 0  
Letter of Credit              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity $ 15,000,000            
Bridge Loan              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity $ 17,500,000