OTHER INCOME AND EXPENSES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other income and expenses
Revenue	$ 19,205	$ 18,272	$ 15,898
Expense	13,869	22,787	9,390
New development expense		5,400
Operating and maintenance revenue
Other income and expenses
Revenue	12,655	10,392	8,621
Expense	13,791	11,895	8,847
Leases
Other income and expenses
Revenue	2,279	2,467	2,015
Expense	35	135	182
Design and construction
Other income and expenses
Revenue	1,745	1,273	1,918
Expense	1,612	1,202	1,635
Meter reading and billing
Other income and expenses
Revenue	412	391	256
Expense	163	157	(6)
Interest income
Other income and expenses
Revenue	92	133	68
Expense	0	0	0
Change in value of life insurance contracts (gain) loss
Other income and expenses
Revenue	0	0	0
Expense	(5,104)	2,340	(3,057)
Other non-regulated income and expenses
Other income and expenses
Revenue	2,022	3,616	3,020
Expense	$ 3,372	$ 7,058	$ 1,789