Segment Information - By Geographic Area (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) customer	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($) customer
Financial information with respect to entity's operations by geographic area
Operating revenues	$ 2,017,548	$ 2,134,043	$ 3,043,383
Property, plant and equipment, net	$ 3,332,498	$ 3,985,707	4,930,549
Goodwill			$ 28,380
Sales Revenue | One customer
Financial information with respect to entity's operations by geographic area
Number of customers | customer	1	1	1
Sales Revenue | Customer Concentration Risk | One customer
Financial information with respect to entity's operations by geographic area
Percentage	31.00%	29.00%	22.00%
UNITED STATES
Financial information with respect to entity's operations by geographic area
Operating revenues	$ 804,807	$ 841,531	$ 1,554,442
Property, plant and equipment, net	1,648,622	1,917,203	2,470,579
Goodwill			13,430
Outside the U.S
Financial information with respect to entity's operations by geographic area
Operating revenues	1,212,741	1,292,512	1,488,941
Property, plant and equipment, net	1,683,876	2,068,504	2,459,970
Goodwill			14,950
Saudi Arabia
Financial information with respect to entity's operations by geographic area
Operating revenues	$ 645,000	$ 642,700	$ 696,400