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Business Segment Data (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments	2	2	2	2
Operating Revenues	$ 37,769	$ 38,713	$ 101,859	$ 104,809
Operating Income	11,983	12,918	27,962	29,989
Net Income	11,119	12,290	25,818	25,459
Capital Expenditures	25,522	21,141	61,220	49,518
Assets	887,353		887,353		$ 767,830
Regulated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	35,000	34,628	93,342	93,002
Operating Income	11,001	12,214	24,937	27,827
Net Income	10,409	11,770	23,700	23,904
Capital Expenditures	25,437	21,141	60,998	49,469
Assets	886,280		886,280		764,749
Non - Regulated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	3,020	4,304	9,032	12,286
Operating Income	982	704	3,025	2,162
Net Income	710	520	2,118	1,555
Capital Expenditures	85		222	49
Assets	9,593		9,593		8,994
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(251)	$ (219)	(515)	$ (479)
Assets	$ (8,520)		$ (8,520)		$ (5,913)

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