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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) item | Jun. 30, 2017 USD ($)
Property, Plant and Equipment |  |  |  |  |
Value of shares sold | $ 21,800 |  |  | $ 302,014 | $ 8,300
Loss on sale of offshore rigs |  | $ 67,320 | $ (2,742) | $ 69,577 | $ 133
Jack Up Rigs |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |
Number of offshore rigs sold | item |  |  |  | 3 |
Sale of offshore jackup rigs in cash | $ 61,400 |  |  |  |
Loss on sale of offshore rigs |  | (63,700) |  | $ (63,700) |
Jack Up Rigs | Other, net |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |
Loss on sale of offshore rigs |  | $ (63,700) |  | $ (63,700) |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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