Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2019 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 12, 2019 |
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||||
| Asset impairment | $ 35,801 | $ 0 | ||
| Discontinued operations | ||||
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||||
| Carrying value, held for sale | $ 91,800 | |||
| Asset impairment | $ 32,600 | |||
| Contract drilling equipment | Discontinued operations | ||||
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||||
| Asset impairment | $ 3,200 | |||