Transactions with Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Transactions with Affiliates [Abstract]
Billings to affiliates	$ 143,674	$ 407,800	$ 479,647	$ 783,938
Affiliated entities
Transactions with Affiliates [Abstract]
Affiliate billings to us	15	26	32	43
Billings to affiliates	1	1	2	2
Rentals paid to affiliate	$ 122	$ 122	$ 244	$ 244