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General - Schedule of Major Streams of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue from contracts with customers	$ 120,007	$ 125,722	$ 294,319	$ 290,146
Alternative revenue programs, net - WCMA	4,193	1,333	7,794	11,248
Other balancing and memorandum accounts revenue, net	(788)	(3,868)	(7,235)	(9,979)
Rental income	1,441	1,391	4,103	4,281
Total revenues	124,853	$ 124,578	298,981	$ 295,696
Reduction of revenue related to cost-recovery balancing accounts	$ 2,527		$ 3,556

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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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