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Segment Information - By Geographic Area (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 USD ($) customer | Dec. 31, 2017 USD ($) customer
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 714,261 | $ 758,076 | $ 771,406 | $ 799,640 | $ 782,080 | $ 779,425 | $ 761,920 | $ 734,194 | $ 3,043,383 | $ 3,057,619 | $ 2,564,285
Property, Plant and Equipment, Net | 4,930,549 |  |  |  | 5,467,870 |  |  |  | 4,930,549 | 5,467,870 | 6,109,565
Goodwill | 28,380 |  |  |  | 183,914 |  |  |  | $ 28,380 | $ 183,914 | $ 173,226
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 |  |  |  |  |  |  |  |  | 22.00% | 24.00% | 29.00%
U.S. Drilling |  |  |  |  |  |  |  |  |  |  |
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 1,554,442 | $ 1,347,448 | $ 973,464
Property, Plant and Equipment, Net | 2,470,579 |  |  |  | 2,892,910 |  |  |  | 2,470,579 | 2,892,910 | 3,163,425
Goodwill | 13,430 |  |  |  | 65,633 |  |  |  | 13,430 | 65,633 | 54,198
Outside the U.S |  |  |  |  |  |  |  |  |  |  |
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,488,941 | 1,710,171 | 1,590,821
Property, Plant and Equipment, Net | 2,459,970 |  |  |  | 2,574,960 |  |  |  | 2,459,970 | 2,574,960 | 2,946,140
Goodwill | $ 14,950 |  |  |  | $ 118,281 |  |  |  | 14,950 | 118,281 | 119,028
Saudi Arabia |  |  |  |  |  |  |  |  |  |  |
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 696,400 | $ 764,500 | $ 727,700

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