Debt - Interest Rates (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
New First Lien Facility
Debt Instrument [Line Items]
Commitment fee percentage			40.00%
New First Lien Facility | Minimum
Debt Instrument [Line Items]
Interest rate during period			5.89%
New First Lien Facility | Maximum
Debt Instrument [Line Items]
Interest rate during period			6.01%
New First Lien Facility | Weighted Average
Debt Instrument [Line Items]
Interest rate during period			6.45%
Original Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate during period			5.28%
Commitment fee percentage			40.00%
Original Ultraco Debt Facility | Weighted Average
Debt Instrument [Line Items]
Interest rate during period			6.80%
Convertible Bond Debt | Minimum
Debt Instrument [Line Items]
Interest rate during period			5.00%
Convertible Bond Debt | Weighted Average
Debt Instrument [Line Items]
Interest rate during period			10.14%
Norwegian Bond Debt
Debt Instrument [Line Items]
Interest rate during period	8.25%	8.25%
Norwegian Bond Debt | Bond Debt
Debt Instrument [Line Items]
Interest rate during period			8.25%
Norwegian Bond Debt | Weighted Average
Debt Instrument [Line Items]
Interest rate during period	8.96%	8.75%
Norwegian Bond Debt | Weighted Average | Bond Debt
Debt Instrument [Line Items]
Interest rate during period			9.04%
New Ultraco Debt Facility
Debt Instrument [Line Items]
Commitment fee percentage		40.00%	40.00%
New Ultraco Debt Facility | Bond Debt
Debt Instrument [Line Items]
Interest rate during period	40.00%
New Ultraco Debt Facility | Minimum
Debt Instrument [Line Items]
Interest rate during period	2.60%	2.73%	4.51%
New Ultraco Debt Facility | Maximum
Debt Instrument [Line Items]
Interest rate during period	2.72%	4.68%	5.26%
New Ultraco Debt Facility | Weighted Average
Debt Instrument [Line Items]
Interest rate during period			4.54%
New Ultraco Debt Facility | Weighted Average | Bond Debt
Debt Instrument [Line Items]
Interest rate during period	3.28%	3.98%
Convertible Debt Securities | Minimum
Debt Instrument [Line Items]
Interest rate during period	5.00%	5.00%
Convertible Debt Securities | Weighted Average
Debt Instrument [Line Items]
Interest rate during period	10.14%	10.14%
Super Senior Revolver Facility
Debt Instrument [Line Items]
Commitment fee percentage		40.00%
Super Senior Revolver Facility | Bond Debt
Debt Instrument [Line Items]
Interest rate during period	2.24%
Super Senior Revolver Facility | Minimum
Debt Instrument [Line Items]
Interest rate during period		2.24%
Super Senior Revolver Facility | Maximum
Debt Instrument [Line Items]
Interest rate during period		2.89%
Super Senior Revolver Facility | Weighted Average | Bond Debt
Debt Instrument [Line Items]
Interest rate during period	2.58%	3.00%
Global Ultraco Debt Facility
Debt Instrument [Line Items]
Commitment fee percentage	40.00%
Global Ultraco Debt Facility | Minimum
Debt Instrument [Line Items]
Interest rate during period	2.35%
Global Ultraco Debt Facility | Maximum
Debt Instrument [Line Items]
Interest rate during period	2.57%
Global Ultraco Debt Facility | Weighted Average | Bond Debt
Debt Instrument [Line Items]
Interest rate during period	3.04%
Holdco Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee percentage	40.00%
Holdco Revolving Credit Facility | Minimum | Bond Debt
Debt Instrument [Line Items]
Interest rate during period	2.55%
Holdco Revolving Credit Facility | Maximum | Bond Debt
Debt Instrument [Line Items]
Interest rate during period	2.60%
Holdco Revolving Credit Facility | Weighted Average | Bond Debt
Debt Instrument [Line Items]
Interest rate during period	5.61%