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LONG-TERM DEBT (Details)
6 Months Ended
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 03, 2020
USD ($)
Jul. 20, 2016
USD ($)
Long-term debt        
Long-term debt, net $ 114,900,000 $ 167,162,000    
Minimum        
Long-term debt        
Commitment fee percentage 0.175%      
Maximum        
Long-term debt        
Commitment fee percentage 0.325%      
Term Loan Facility        
Long-term debt        
Face amount of debt     $ 200,000,000.0  
Amount outstanding $ 135,000,000.0      
Payment that are due in next twelve months 17,500,000      
Optional prepayment 42,500,000      
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     $ 17,500,000  
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 $ 135,000,000.0      
Total leverage ratio 1.5      
Fixed charge coverage ratio 5.2      
Unamortized debt issuance costs $ 2,600,000      
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 4.0      
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 1.00%      
Revolving Credit Facility | Minimum | Base Rate        
Long-term debt        
Percentage points added to the reference rate 0.00%      
Revolving Credit Facility | Maximum | LIBOR        
Long-term debt        
Percentage points added to the reference rate 2.00%      
Revolving Credit Facility | Maximum | Base Rate        
Long-term debt        
Percentage points added to the reference rate 1.00%      
Term Loan Facility        
Long-term debt        
Payment that are due in next twelve months $ 17,500,000      
Mandatory payment $ 5,000,000.0