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Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Regulatory Asset Increase (Decrease)	$ 2,516	$ (4,984)
Revenue from contracts with customers	549,270	447,720	$ 389,302
Alternative revenue programs, net	(493)	(18,232)	10,456
Other balancing and memorandum accounts revenue and regulatory mechanisms, net	10,217	(14,403)	(7,541)
Rental income	5,532	5,397	5,482
Operating revenue	564,526	420,482	397,699
Regulated operating revenue, water surcharge	$ 4,911	$ 4,955	$ 5,013

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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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