OTHER INCOME AND EXPENSES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other income and expenses
Revenue	$ 15,624	$ 17,318	$ 14,795
Expense	14,044	14,285	11,265
Operating and Maintenance
Other income and expenses
Revenue	9,385	9,748	8,028
Expense	10,438	10,256	9,119
Leases
Other income and expenses
Revenue	1,929	2,029	1,938
Expense	208	208	243
Design and Construction
Other income and expenses
Revenue	1,399	1,258	1,374
Expense	1,292	1,102	1,173
Meter Reading and Billing
Other income and expenses
Revenue	597	803	1,313
Expense	434	615	1,055
Interest Income
Other income and expenses
Revenue	39	186	70
Expense	0	0	0
Change in value of life insurance contracts (gain) loss
Other income and expenses
Revenue	0	0	0
Expense	218	(994)	(1,878)
Other non-regulated income and expenses
Other income and expenses
Revenue	2,275	3,294	2,072
Expense	$ 1,454	$ 3,098	$ 1,553