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DEBT - Revolving Credit (Details)
3 Months Ended 6 Months Ended
Dec. 21, 2018
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                
Fixed charge coverage ratio 1.0              
Long-term debt, gross   $ 460,228,000   $ 460,228,000     $ 460,228,000  
Interest expense   5,882,000 $ 7,020,000 12,154,000 $ 14,110,000      
Liquidity position to meet future obligations, amount   303,600,000   303,600,000     $ 308,100,000  
Revolving Credit Facility                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 0   0      
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%              
Long-term debt, gross   45,000,000.0   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        
Interest expense   $ 200,000   $ 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