Summary of Significant Accounting Policies - Goodwill (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($)
Goodwill
Long-term growth rate used to calculate terminal values for each reporting unit (as a percent)	2.00%
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill - Beginning Balance	$ 28,380
Disposals and Impairments	(27,798)
Cumulative Translation Adjustment	(582)
Goodwill - Ending Balance
Drilling Solutions
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill - Beginning Balance	11,436
Disposals and Impairments	(11,436)
Rig Technologies
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill - Beginning Balance	16,944
Disposals and Impairments	(16,362)
Cumulative Translation Adjustment	$ (582)

No Definition Available.

No definition available.

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- Definition

Represents the growth rate used to calculate terminal values for each reporting unit using a Gordon Growth methodology.

+ References

No definition available.

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- Definition

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.

+ References

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- Definition

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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- Definition

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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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