Segment Information - Depreciation and amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	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)