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General - Major Streams of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Revenue from contracts with customers	$ 112,238	$ 105,136
Alternative revenue programs, net	112	504
Other balancing and memorandum accounts revenue, net	1,091	8,744
Rental income	1,344	1,370
Total revenues	$ 114,785	$ 115,754

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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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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