General - Schedule of Major Streams of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue from contracts with customers	$ 142,163	$ 104,299	$ 247,299	$ 183,227
Alternative revenue programs, net	3,049	(327)	3,553	(2,306)
Other balancing and memorandum accounts revenue, net	553	(2,376)	9,297	(3,009)
Rental income	1,444	1,369	2,814	2,735
Total revenues	$ 147,209	$ 102,965	$ 262,963	$ 180,647