Revenue from Contracts with Customer (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) contract
Unit Credit Agreement [Member]
Segment Reporting Information [Line Items]
Commitment fee percentage under credit facility	0.375%
Origination, agency and syndication and other related fees with the credit agreement | $	$ 3.3
Drilling [Member]
Segment Reporting Information [Line Items]
Number of Contracts, Daywork | contract	6
Drilling [Member] | Short-term Contract with Customer [Member]
Segment Reporting Information [Line Items]
Contract Duration	2 months
Drilling [Member] | Long-term Contract with Customer [Member]
Segment Reporting Information [Line Items]
Contract Duration	2 years