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Segment Information - By Geographic Area (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) customer | Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 USD ($) customer
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 443,396 | $ 438,352 | $ 533,931 | $ 718,364 | $ 714,261 | $ 758,076 | $ 771,406 | $ 799,640 | $ 2,134,043 | $ 3,043,383 | $ 3,057,619
Property, plant and equipment, net | 3,985,707 |  |  |  | 4,930,549 |  |  |  | $ 3,985,707 | 4,930,549 | 5,467,870
Goodwill |  |  |  |  | 28,380 |  |  |  |  | $ 28,380 | $ 183,914
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 |  |  |  |  |  |  |  |  | 29.00% | 22.00% | 24.00%
United States |  |  |  |  |  |  |  |  |  |  |
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 841,531 | $ 1,554,442 | $ 1,347,448
Property, plant and equipment, net | 1,917,203 |  |  |  | 2,470,579 |  |  |  | 1,917,203 | 2,470,579 | 2,892,910
Goodwill |  |  |  |  | 13,430 |  |  |  |  | 13,430 | 65,633
Outside the U.S |  |  |  |  |  |  |  |  |  |  |
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,292,512 | 1,488,941 | 1,710,171
Property, plant and equipment, net | $ 2,068,504 |  |  |  | 2,459,970 |  |  |  | 2,068,504 | 2,459,970 | 2,574,960
Goodwill |  |  |  |  | $ 14,950 |  |  |  |  | 14,950 | 118,281
Saudi Arabia |  |  |  |  |  |  |  |  |  |  |
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 642,700 | $ 696,400 | $ 764,500

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