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LONG-TERM DEBT (Narrative) (Details) - USD ($)
24 Months Ended
Dec. 31, 2019
Feb. 13, 2019
Dec. 01, 2014
Line of Credit Facility [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 74,900,000    
Line of Credit Facility, Maximum Borrowing Capacity     $ 75,000,000.0
Revolving Credit Facility [Member] | Subsequent Event [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 75,000,000  
Sublimit Letters of Credit [Member] | Subsequent Event [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   7,500,000  
Credit Facility, Additional [Member] | Subsequent Event [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 25,000,000  
Prime Rate [Member]      
Line of Credit Facility [Line Items]      
Spread On Variable Rate Credit Facility 0.25%    
LIBOR Rate [Member]      
Line of Credit Facility [Line Items]      
Spread On Variable Rate Credit Facility 1.25%