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NOTES PAYABLE TO BANKS - Credit Facility (Details)
$ in Thousands
3 Months Ended
Oct. 26, 2018
USD ($)
Mar. 31, 2020
USD ($)
Lender
Dec. 31, 2018
USD ($)
Amendment      
Revolving credit facility      
Minimum EBITDA $ 50,000    
Maximum consolidated leverage ratio 2.50%    
Minimum debt service coverage ratio 2.00%    
Minimum net worth covenant $ 600,000    
Revolving credit facility      
Revolving credit facility      
Number of additional credit lenders | Lender   5  
Maximum borrowing capacity   $ 125,000  
Origination and other costs   3,300  
Unamortized origination and other costs   200  
Outstanding debt   0  
Available credit facility   $ 105,200  
Revolving credit facility | Minimum      
Revolving credit facility      
Annual fee (as a percent)   0.15%  
Revolving credit facility | Maximum      
Revolving credit facility      
Annual fee (as a percent)   0.25%  
Revolving credit facility | Amendment      
Revolving credit facility      
Reduction in commitment fees (in points) 7.50%    
Revolving credit facility | Amendment | Eurodollar Rate | LIBOR | Minimum      
Revolving credit facility      
Basis points added   1.125%  
Revolving credit facility | Amendment | Eurodollar Rate | LIBOR | Maximum      
Revolving credit facility      
Basis points added   2.125%  
Revolving credit facility | Amendment | Base Rate | Minimum      
Revolving credit facility      
Basis points added   0.125%  
Revolving credit facility | Amendment | Base Rate | Maximum      
Revolving credit facility      
Basis points added   1.125%  
Revolving credit facility | Amendment | Base Rate | Federal Funds Rate      
Revolving credit facility      
Basis points added   0.50%  
Revolving credit facility | Amendment | Base Rate | Eurodollar Rate      
Revolving credit facility      
Basis points added   1.00%  
Revolving credit facility | Letter of credit      
Revolving credit facility      
Maximum borrowing capacity   $ 35,000 $ 50,000
Outstanding debt   19,800  
Revolving credit facility | Letter of credit | Amendment      
Revolving credit facility      
Maximum borrowing capacity $ 35,000    
Revolving credit facility | Swingline      
Revolving credit facility      
Maximum borrowing capacity   $ 35,000