Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 326,303	$ 312,148
Less accumulated depreciation	(92,749)	(85,093)
Net property, plant and equipment	233,554	227,055
Mains/lines/sewers
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 138,173	131,768
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	49 years
Plant
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 94,615	81,471
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	31 years
Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 35,497	37,392
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	14 years
Meters
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 14,057	13,606
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	13 years
Furniture, fixture and leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 623	371
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	21 years
Computer and office equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 785	639
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	7 years
Software
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 241	241
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	3 years
Land and land rights
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,051	897
Other
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	700	589
Construction work-in-process
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 40,561	$ 45,174