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Summary of Significant Accounting Policies (Revenue) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 14, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Water Reduction Target Goal, Percentage	20.00%
Revenue from contracts with customers		$ 389,302	$ 381,777	$ 328,249
Alternative revenue programs, net - WCMA		10,456	12,584	9,981
Other balancing and memorandum accounts revenue, net		(7,541)	(10,838)	(5,241)
Rental income		5,482	5,702	6,717
Operating revenue		397,699	389,225	339,706
Balancing and Memorandum Cost Recovery Account, Increase (Decrease)		2,643
Regulated operating revenue, water surcharge		$ 5,013	$ 5,017	$ 3,770

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Balancing and Memorandum Cost Recovery Account, Increase (Decrease)

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Regulated Operating Revenue, Water Surcharge

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Regulatory Balancing and Memorandum Accounts Revenue, Net

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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