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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

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