CASH FLOW INFORMATION (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOW INFORMATION
Cash paid for interest	$ 12,243,000	$ 10,589,000	$ 9,942,000
Cash paid for state income taxes	76,000	$ 61,000	$ 47,000
Non-cash financing activities in connection with acquisition	$ 21,000,000