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LONG-TERM DEBT (Narrative) (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Line of Credit Facility [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 71,000,000.0    
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 75,000,000    
Credit facility borrowings 0 $ 0 $ 0
Sublimit Letters of Credit [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 7,500,000    
Credit Facility, Additional [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000,000