Related Party Transactions - Schedule of Related Party Transactions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Related Party Transactions [Abstract]
Operating expenses—related parties	$ 1,300,000	$ 1,400,000	$ 4,100,000	$ 4,300,000
Maintenance expenses—related parties	100,000	0	300,000	100,000
General and administrative—related parties	3,500,000	3,500,000	11,000,000.0	10,600,000
Total costs and expenses—related parties	4,900,000	4,900,000	15,400,000	15,000,000.0
Related Party Transaction [Line Items]
Deficiency revenue	$ 5,100,000	$ 2,400,000	11,100,000	2,400,000
BP Products
Related Party Transaction [Line Items]
Deficiency revenue			$ 6,000,000.0	$ 0.0