Revenue from Contracts with Customers (Narrative) (Details) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Aug. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($)	Jan. 01, 2018 USD ($)
Segment Reporting Information [Line Items]
Retained earnings (deficit)	$ (18,140)		$ (18,140)	$ 199,135
Change in contact assets and liabilities, net	1,316	$ 2,459		(2,577)
Shortfall fees recognized	$ 4,000	$ 1,300		0
Minimum
Segment Reporting Information [Line Items]
Contact duration			2 months
Number of days for drilling of one well			10 days
Maximum
Segment Reporting Information [Line Items]
Contact duration			1 year
Number of days for drilling of one well			90 days
Oil and Natural Gas
Segment Reporting Information [Line Items]
Revenue Satisfied at Point in Time, Transfer of Control			Revenues from our sales are recognized when our customer obtains control of the sold product. For sales we make to other mid-stream and downstream oil and gas companies, control typically occurs at a point on delivery to the customer.
Oil and Natural Gas | Adjustments due to ASC606 [Member]
Segment Reporting Information [Line Items]
Retained earnings (deficit)					$ 0
Drilling
Segment Reporting Information [Line Items]
Revenue Satisfied over Time, Method Used			At inception, the total transaction price is estimated to include any applicable fixed consideration, unconstrained variable consideration (estimated day rate mobilization and demobilization revenue, estimated operating day rate revenue to be earned over the contract term, expected bonuses (if material and can be reasonably estimated without significant reversal)), and penalties (if material and can be reasonably estimated without significant reversal). The estimation of the transaction price for unconstrained variable consideration does not differ materially from the previous revenue accounting standard. A contract liability will be recorded for consideration received before the corresponding transfer of services. Those liabilities will generally only arise in relation to upfront mobilization fees paid in advance and are allocated/recognized over the entire performance obligation. Such balances if material will be amortized over the recognition period based on the same method of measure used for revenue.
Number of daywork contracts | contract			9
Revenue, Practical Expedient, Initial Application and Transition, Qualitative Assessment			Most of our drilling contracts have an original term of less than one year; however, the remaining performance obligations under the contracts with a longer duration are not material.
Drilling | Long-term Contract with Customer [Member]
Segment Reporting Information [Line Items]
Number of daywork contracts | contract			5
Drilling | Minimum
Segment Reporting Information [Line Items]
Contact duration			2 months
Number of days for drilling of one well			10 days
Drilling | Minimum | Long-term Contract with Customer [Member]
Segment Reporting Information [Line Items]
Contact duration			2 months
Drilling | Maximum
Segment Reporting Information [Line Items]
Contact duration			3 years
Number of days for drilling of one well			90 days
Drilling | Maximum | Long-term Contract with Customer [Member]
Segment Reporting Information [Line Items]
Contact duration			1 year
Mid-Stream
Segment Reporting Information [Line Items]
Change in contact assets and liabilities, net			$ 3,775	$ (2,600)
Mid-Stream | Adjustments due to ASC606 [Member]
Segment Reporting Information [Line Items]
Adjustment to opening retained earnings, before tax					(1,700)
Adjustment to opening retained earnings, after tax					$ (1,300)