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LONG-TERM DEBT (Revolving Credit Facility and Stock Restrictions) (Details) - USD ($)
Dec. 31, 2019
Sep. 30, 2019
Oct. 16, 2014
Reastated Credit Agreement      
Debt Instrument [Line Items]      
General restricted payments allowance $ 150,000,000.0    
Restricted payments capacity additions as percent of net income 50.00%    
Restricted payments capacity additions as percent of cash proceeds from sale of equity 100.00%    
Reastated Credit Agreement | Maximum      
Debt Instrument [Line Items]      
Consolidated leverage ratio 300.00%    
Annual principal payment $ 20,000,000.0    
Bank of America | Reastated Credit Agreement      
Debt Instrument [Line Items]      
Current borrowing capacity     $ 250,000,000.0
Remaining borrowing capacity $ 47,300,000    
Bank of America | Reastated Credit Agreement | Federal Funds      
Debt Instrument [Line Items]      
Interest rate 0.50%    
Bank of America | Reastated Credit Agreement | LIBOR      
Debt Instrument [Line Items]      
Interest rate 1.00% 1.25%  
Bank of America | Reastated Credit Agreement | LIBOR | Minimum      
Debt Instrument [Line Items]      
Interest rate 1.00%    
Bank of America | Reastated Credit Agreement | LIBOR | Maximum      
Debt Instrument [Line Items]      
Interest rate 2.00%    
Bank of America | Reastated Credit Agreement | Base Rate      
Debt Instrument [Line Items]      
Interest rate   0.25%  
Bank of America | Reastated Credit Agreement | Base Rate | Minimum      
Debt Instrument [Line Items]      
Interest rate 0.15%    
Bank of America | Reastated Credit Agreement | Base Rate | Maximum      
Debt Instrument [Line Items]      
Interest rate 1.00%    
Bank of America | Reastated Credit Agreement | Guarantee Obligations      
Debt Instrument [Line Items]      
Amount of letters of credit outstanding $ 12,700,000    
Bank of America | Standby Letters of Credit      
Debt Instrument [Line Items]      
Face amount 50,000,000.0   $ 50,000,000.0
Bank of America | New Vehicle Revolving Floor Plan Facility      
Debt Instrument [Line Items]      
Current borrowing capacity 60,000,000.0    
Remaining borrowing capacity $ 190,000,000.0    
Bank of America | New Vehicle Floor Plan Facility | LIBOR      
Debt Instrument [Line Items]      
Interest rate 1.10%    
Bank of America | New Vehicle Floor Plan Facility | Base Rate      
Debt Instrument [Line Items]      
Interest rate 0.10%    
Bank of America | Used Vehicle Floor Plan Facility | LIBOR      
Debt Instrument [Line Items]      
Interest rate 1.40%    
Bank of America | Used Vehicle Floor Plan Facility | Base Rate      
Debt Instrument [Line Items]      
Interest rate 0.40%