Transactions with Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Transactions with Affiliates [Abstract]
Billings to affiliates	$ 263,987	$ 411,699	$ 743,634	$ 1,195,637
Affiliated entities
Transactions with Affiliates [Abstract]
Affiliate billings (refunds) to us	(15)	20	17	63
Billings to affiliates	1	1	3	3
Rentals paid to affiliate	$ 256	$ 122	$ 500	$ 366