OTHER INCOME AND EXPENSES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other income and expenses
Revenue	$ 16,922	$ 19,205	$ 18,272
Expense	14,300	13,869	22,787
New development expense			5,400
Operating and maintenance revenue
Other income and expenses
Revenue	11,481	12,655	10,392
Expense	13,551	13,791	11,895
Leases
Other income and expenses
Revenue	2,398	2,279	2,467
Expense	48	35	135
Design and construction
Other income and expenses
Revenue	802	1,745	1,273
Expense	704	1,612	1,202
Meter reading and billing
Other income and expenses
Revenue	458	412	391
Expense	109	163	157
Interest income
Other income and expenses
Revenue	52	92	133
Expense	0	0	0
Change in value of life insurance contracts (gain) loss
Other income and expenses
Revenue	0	0	0
Expense	(4,293)	(5,104)	2,340
Other non-regulated income and expenses
Other income and expenses
Revenue	1,731	2,022	3,616
Expense	$ 4,181	$ 3,372	$ 7,058