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General - Schedule of Major Streams of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue from contracts with customers	$ 78,926	$ 75,869
Alternative revenue programs, net - WCMA	(1,979)	(332)
Other balancing and memorandum accounts revenue, net	(631)	(1,836)
Rental income	1,366	1,341
Total revenues	$ 77,682	$ 75,042

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Alternative Revenue Programs, Net

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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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