Debt - Interest Rates (Details)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
New Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate		4.15%
Commitment fee percentage	40.00%	40.00%
Norwegian Bond Debt Facility
Debt Instrument [Line Items]
Interest rate		8.25%
Norwegian Bond Debt Facility | Senior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	8.25%
Super Senior Facility
Debt Instrument [Line Items]
Commitment fee percentage	40.00%
Super Senior Facility | Senior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	2.90%
New First Lien Facility
Debt Instrument [Line Items]
Interest rate		6.01%
Minimum | Convertible Bond Debt
Debt Instrument [Line Items]
Interest rate	5.00%
Minimum | New Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate	3.39%
Minimum | New First Lien Facility
Debt Instrument [Line Items]
Interest rate		5.89%
Minimum | Original Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate		5.28%
Weighted Average | Convertible Bond Debt
Debt Instrument [Line Items]
Interest rate	10.14%
Weighted Average | New Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate	5.52%	5.26%
Weighted Average | Norwegian Bond Debt Facility
Debt Instrument [Line Items]
Interest rate		8.96%
Weighted Average | Norwegian Bond Debt Facility | Senior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	8.91%
Weighted Average | Super Senior Facility | Senior Subordinated Notes
Debt Instrument [Line Items]
Interest rate	3.00%
Weighted Average | New First Lien Facility
Debt Instrument [Line Items]
Interest rate		6.45%
Commitment fee percentage		40.00%
Weighted Average | Original Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate		6.80%
Commitment fee percentage		40.00%
Maximum | New Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate	4.68%