Commitments and Contingencies In Text Linking (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Amount spent on purchased water contracts	$ 1,823,000	$ 1,532,000	$ 1,556,000
Reserve against tangible property deductions	1,000,000
Reserve against tangible property deductions	3,300,000	$ 4,600,000
Board Approved Capital Budget in Next Fiscal Year	$ 85,700,000