LONG-TERM DEBT (Narrative) (Details)	6 Months Ended
	Jun. 30, 2018 USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 59,200,000.0
Line of Credit Facility, Maximum Borrowing Capacity	$ 75,000,000
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%