Revenue and Customers Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 241,836	$ 275,526	$ 761,065	$ 851,350
Contract drilling services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	227,050	259,428	714,555	804,746
Floaters
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	127,286	131,039	367,304	428,272
Jackups
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 99,764	$ 128,389	$ 347,251	$ 376,474