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LONG-TERM DEBT (Details)
6 Months Ended 12 Months Ended
Jun. 09, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jul. 20, 2016
USD ($)
Long-term debt        
Long-term debt, net   $ 181,684,000 $ 175,415,000  
Term loan        
Long-term debt        
Mandatory principal payment due in next twelve months   25,000,000.0    
Term loan | Amount converted to a term loan        
Long-term debt        
Mandatory principal payment     3,800,000  
Amended Credit Facility, July 20, 2021        
Long-term debt        
Maximum borrowing capacity   75,000,000.0 50,000,000.0 $ 250,000,000.0
Revolving loan outstanding amount     200,000,000.0  
Outstanding balance   16,000,000.0    
Remaining available borrowings   $ 34,000,000    
Total leverage ratio   5.2    
Fixed charge coverage ratio   1.7    
Amended Credit Facility, July 20, 2021 | COVID-19 Pandemic        
Long-term debt        
Maximum borrowing capacity   $ 34,000,000.0    
Amended Credit Facility, July 20, 2021 | Minimum        
Long-term debt        
Fixed charge coverage ratio   1.15    
Additional borrowing capacity   $ 15,000,000.0    
Integral multiple additional borrowing capacity   $ 1,000,000.0    
Amended Credit Facility, July 20, 2021 | Minimum | LIBOR        
Long-term debt        
Interest rate (as a percent)   1.00%    
Amended Credit Facility, July 20, 2021 | Minimum | Base Rate        
Long-term debt        
Interest rate (as a percent)   0.00%    
Amended Credit Facility, July 20, 2021 | Maximum        
Long-term debt        
Total leverage ratio   3.5    
Amended Credit Facility, July 20, 2021 | Maximum | LIBOR        
Long-term debt        
Interest rate (as a percent)   2.50%    
Amended Credit Facility, July 20, 2021 | Maximum | Base Rate        
Long-term debt        
Interest rate (as a percent)   1.50%    
Amended Credit Facility, July 20, 2021 | Standby Letter of Credit        
Long-term debt        
Amount outstanding   $ 600,000    
Amount drawn under the facility   0    
Amended Credit Facility, July 20, 2021 | Term loan        
Long-term debt        
Amount outstanding   191,300,000    
Amended Credit Facility, July 20, 2021 | Term loan | Amount converted to a term loan        
Long-term debt        
Outstanding balance     $ 200,000,000.0  
Amended Credit Facility        
Long-term debt        
Remaining available borrowings   $ 34,000,000.0    
Operational liquidity $ 24,000,000      
Commitment fees 0.45%      
Amended Credit Facility | LIBOR        
Long-term debt        
Interest rate (as a percent) 2.50%      
Amended Credit Facility | Base Rate        
Long-term debt        
Interest rate (as a percent) 1.50%      
Amended Credit Facility | Minimum        
Long-term debt        
Operational liquidity $ 25,000,000      
Amended Credit Facility | Maximum        
Long-term debt        
Maximum borrowing capacity $ 26,000,000