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LONG-TERM DEBT (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Sep. 03, 2020
USD ($)
Jul. 20, 2016
USD ($)
Long-term debt          
Long-term debt, net $ 142,455,000   $ 167,162,000    
Minimum          
Long-term debt          
Commitment fee percentage 0.35%        
Maximum          
Long-term debt          
Commitment fee percentage 0.575%        
Term Loan Facility          
Long-term debt          
Face amount of debt       $ 200,000,000.0  
Amount outstanding $ 160,000,000.0        
Payment that are due in next twelve months 15,000,000.0        
Term Loan Facility | Period From December 31, 2020 To September 30, 2021          
Long-term debt          
Interest rate       1.25%  
Term Loan Facility | Period From December 31, 2021 And Thereafter          
Long-term debt          
Interest rate       2.50%  
Term Loan Facility | Due in the next twelve months          
Long-term debt          
Mandatory principal payment due in next twelve months       $ 15,000,000.0  
Prior Credit Facility          
Long-term debt          
Maximum borrowing capacity         $ 250,000,000.0
Fourth Amended Credit Facility          
Long-term debt          
Maximum borrowing capacity       270,000,000.0  
Long-term debt, net $ 160,000,000.0        
Total leverage ratio 2.1        
Fixed charge coverage ratio 4.6        
Unamortized debt issuance costs $ 2,500,000        
Fourth Amended Credit Facility | COVID-19 Pandemic          
Long-term debt          
Maximum borrowing capacity $ 70,000,000.0        
Fourth Amended Credit Facility | Minimum          
Long-term debt          
Fixed charge coverage ratio 1.15        
Fourth Amended Credit Facility | Maximum          
Long-term debt          
Total leverage ratio 4.75        
Revolving Credit Facility          
Long-term debt          
Maximum borrowing capacity $ 75,000,000.0     70,000,000  
Remaining available borrowings   $ 70,000,000.0      
Amount drawn under the facility   $ 0      
Additional borrowing capacity       $ 75,000,000.0  
Revolving Credit Facility | Minimum          
Long-term debt          
Additional borrowing capacity 15,000,000.0        
Integral multiple additional borrowing capacity $ 1,000,000.0        
Revolving Credit Facility | Minimum | LIBOR          
Long-term debt          
Percentage points added to the reference rate 1.75%        
Revolving Credit Facility | Minimum | Base Rate          
Long-term debt          
Percentage points added to the reference rate 0.75%        
Revolving Credit Facility | Maximum | LIBOR          
Long-term debt          
Percentage points added to the reference rate 3.25%        
Revolving Credit Facility | Maximum | Base Rate          
Long-term debt          
Percentage points added to the reference rate 2.25%        
Term Loan Facility          
Long-term debt          
Optional prepayment $ 20,000,000.0        
Mandatory payment $ 2,500,000