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Segment Information - Depreciation and amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Information |  |  |
Depreciation and amortization | $ 645,294 | $ 665,072 | $ 693,381
Operating segments | U.S. Drilling |  |  |
Segment Information |  |  |
Depreciation and amortization | 271,308 | 311,759 | 326,361
Operating segments | Canada Drilling |  |  |
Segment Information |  |  |
Depreciation and amortization |  |  | 11,604
Operating segments | International Drilling |  |  |
Segment Information |  |  |
Depreciation and amortization | 347,784 | 329,335 | 323,431
Operating segments | Drilling Solutions |  |  |
Segment Information |  |  |
Depreciation and amortization | 18,634 | 20,829 | 26,660
Operating segments | Rig Technologies |  |  |
Segment Information |  |  |
Depreciation and amortization | 7,864 | 5,794 | 8,191
Other reconciling items |  |  |
Segment Information |  |  |
Depreciation and amortization | $ (296) | $ (2,645) | $ (2,866)

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