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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill - Beginning Balance		$ 183,914
Disposals and Impairments		(93,634)
Cumulative Translation Adjustment		365
Goodwill - Ending Balance	$ 90,645	$ 90,645
Goodwill
Long-term growth rate used to calculate terminal values for each reporting unit (as a percent)		2.00%
Goodwill impairments	93,634	$ 93,634
U.S. Drilling
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill - Beginning Balance		50,149
Other Adjustment		2,054
Goodwill - Ending Balance	52,203	52,203
International Drilling
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill - Beginning Balance		75,634
Disposals and Impairments		(75,634)
Goodwill
Goodwill impairments	75,600	75,600
Drilling Solutions
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill - Beginning Balance		11,436
Goodwill - Ending Balance	11,436	11,436
Rig Technologies
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill - Beginning Balance		46,695
Disposals and Impairments		(18,000)
Cumulative Translation Adjustment		365
Other Adjustment		(2,054)
Goodwill - Ending Balance	27,006	27,006
Goodwill
Goodwill impairments	$ 18,000	$ 18,000

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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