Debt - Interest Rates (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
New Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate				5.26%
Commitment fee percentage	40.00%	40.00%	40.00%
Norwegian Bond Debt Facility
Debt Instrument [Line Items]
Interest rate		8.25%		8.25%
Norwegian Bond Debt Facility | Senior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	8.25%		8.25%
Super Senior Facility
Debt Instrument [Line Items]
Commitment fee percentage	40.00%		40.00%
Super Senior Facility | Senior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	2.79%		3.19%
New First Lien Facility
Debt Instrument [Line Items]
Interest rate		6.01%		6.01%
Minimum | Convertible Bond Debt
Debt Instrument [Line Items]
Interest rate	5.00%	500.00%	5.00%	500.00%
Minimum | New Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate	2.73%	4.68%	2.73%	4.15%
Minimum | Super Senior Facility | Senior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	2.89%		2.89%
Minimum | New First Lien Facility
Debt Instrument [Line Items]
Interest rate		5.89%		5.89%
Minimum | Original Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate		5.28%		5.28%
Weighted Average | Convertible Bond Debt
Debt Instrument [Line Items]
Interest rate	10.14%	10.14%	10.14%	10.14%
Weighted Average | New Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate		5.27%		4.93%
Commitment fee percentage				40.00%
Weighted Average | New Ultraco Debt Facility | Senior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	3.56%		4.23%
Weighted Average | Norwegian Bond Debt Facility
Debt Instrument [Line Items]
Interest rate		9.07%		8.97%
Weighted Average | Norwegian Bond Debt Facility | Senior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	9.01%		8.96%
Weighted Average | New First Lien Facility
Debt Instrument [Line Items]
Interest rate		6.45%		6.45%
Commitment fee percentage		40.00%		40.00%
Weighted Average | Original Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate		6.80%		6.80%
Commitment fee percentage		40.00%		40.00%
Maximum | New Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate	4.28%	4.76%	4.68%
Maximum | Super Senior Facility | Senior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	2.43%		2.43%