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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
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 |  | $ 28,380 |
Acquisitions and purchase price adjustment |  |  |  |
Disposals and Impairments | (27,800) | $ (93,634) | (27,798) | $ (93,634)
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 |  | 11,436 |
Acquisitions and purchase price adjustment |  |  |  |
Disposals and Impairments |  |  | (11,436) |
Cumulative Translation Adjustment |  |  |  |
Goodwill - Ending Balance |  |  |  |
Rig Technologies |  |  |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |  |
Goodwill - Beginning Balance | $ 16,944 |  | 16,944 |
Acquisitions and purchase price adjustment |  |  |  |
Disposals and Impairments |  |  | (16,362) | $ (18,000)
Cumulative Translation Adjustment |  |  | (582) |
Goodwill - Ending Balance |  |  |  |

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- Definition The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value also includes purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value. + References No definition available. + Details
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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. + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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