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LONG-TERM DEBT (Details)
$ in Thousands
12 Months Ended
Sep. 03, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Long-term debt      
Long-term debt, net   $ 167,162 $ 175,415
Outstanding loan amount   2,800  
Mandatory principal payment   12,500  
Money Market Funds      
Long-term debt      
Cash   $ 2,000  
Minimum      
Long-term debt      
Commitment fees   0.35%  
Maximum      
Long-term debt      
Commitment fees   0.575%  
Revolving credit facility      
Long-term debt      
Maximum borrowing capacity $ 250,000 $ 75,000  
Amount outstanding   182,500  
Remaining available borrowings   70,000  
Amount drawn under the facility   $ 0  
Total leverage ratio   2.6  
Fixed charge coverage ratio   5.6  
Revolving credit facility | Minimum      
Long-term debt      
Fixed charge coverage ratio   1.15  
Additional borrowing capacity   $ 15,000  
Integral multiple additional borrowing capacity   $ 1,000  
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      
Long-term debt      
Total leverage ratio   4.75  
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%  
Amended Credit Facility | LIBOR      
Long-term debt      
Percentage points added to the reference rate   2.25%  
Fourth Amended Credit Facility      
Long-term debt      
Maximum borrowing capacity 270,000    
Remaining available borrowings   $ 70,000  
Fourth Amended Credit Facility | COVID-19 Pandemic      
Long-term debt      
Maximum borrowing capacity   70,000  
Term Loan Facility      
Long-term debt      
Maximum borrowing capacity 200,000    
Quarterly principal payment 200,000    
Amount outstanding   $ 182,500  
Percentage points added to the reference rate   2.25%  
Interest rate (as a percent)   2.75%  
Mandatory principal payment due in next twelve months $ 12,500    
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 | LIBOR Floor      
Long-term debt      
Percentage points added to the reference rate   0.50%  
New Revolving Credit Facility      
Long-term debt      
Maximum borrowing capacity $ 70,000    
Standby Letter of Credit      
Long-term debt      
Amount outstanding   $ 600