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LONG-TERM DEBT (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 20, 2016
USD ($)
Long-term debt        
Long-term debt, net $ 173,049,000 $ 175,415,000    
Current portion of long-term debt 22,500,000 20,000,000    
Term loan        
Long-term debt        
Mandatory principal payment due in next twelve months 22,500,000      
Term loan | Amount converted to a term loan        
Long-term debt        
Mandatory principal payment 3,800,000      
Term loan | COVID-19 Pandemic        
Long-term debt        
Limited covenant waiver, including a deferral of its mandatory principal payment 5,000,000      
Amended Credit Facility, July 20, 2021        
Long-term debt        
Maximum borrowing capacity 75,000,000 50,000,000   $ 250,000,000
Revolving loan outstanding amount     $ 200,000,000  
Remaining available borrowings $ 50,000,000      
Total leverage ratio 3.5      
Fixed charge coverage ratio 3.5      
Amended Credit Facility, July 20, 2021 | COVID-19 Pandemic        
Long-term debt        
Maximum borrowing capacity $ 50,000,000      
Amended Credit Facility, July 20, 2021 | LIBOR        
Long-term debt        
Interest rate (as a percent) 1.75%      
Variable interest rate (as a percent) 0.99%      
Amended Credit Facility, July 20, 2021 | Minimum        
Long-term debt        
Fixed charge coverage ratio 1.15      
Additional borrowing capacity $ 15,000,000      
Integral multiple additional borrowing capacity $ 1,000,000      
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 3.50      
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 $ 196,300,000      
Amended Credit Facility, July 20, 2021 | Term loan | Amount converted to a term loan        
Long-term debt        
Outstanding balance   $ 200,000,000