Debt - Interest Rates (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New First Lien Facility
Debt Instrument [Line Items]
Interest rate during period			4.83%
Commitment fee percentage	40.00%
New First Lien Facility | Minimum
Debt Instrument [Line Items]
Interest rate during period	5.89%	4.91%
New First Lien Facility | Maximum
Debt Instrument [Line Items]
Interest rate during period	6.01%	5.89%
New First Lien Facility | Weighted Average
Debt Instrument [Line Items]
Interest rate during period	6.45%	6.12%	5.21%
Commitment fee percentage		40.00%
Original Ultraco Debt Facility
Debt Instrument [Line Items]
Interest rate during period	5.28%
Commitment fee percentage	40.00%
Original Ultraco Debt Facility | Minimum
Debt Instrument [Line Items]
Interest rate during period		4.64%
Original Ultraco Debt Facility | Maximum
Debt Instrument [Line Items]
Interest rate during period		5.76%
Original Ultraco Debt Facility | Weighted Average
Debt Instrument [Line Items]
Interest rate during period	6.80%	5.58%
Commitment fee percentage		40.00%
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%
Norwegian Bond Debt | Bond Debt
Debt Instrument [Line Items]
Interest rate during period	8.25%		8.25%
Norwegian Bond Debt | Weighted Average
Debt Instrument [Line Items]
Interest rate during period		8.91%
Norwegian Bond Debt | Weighted Average | Bond Debt
Debt Instrument [Line Items]
Interest rate during period	9.04%		8.84%
New Ultraco Debt Facility
Debt Instrument [Line Items]
Commitment fee percentage	40.00%
New Ultraco Debt Facility | Minimum
Debt Instrument [Line Items]
Interest rate during period	4.51%
New Ultraco Debt Facility | Maximum
Debt Instrument [Line Items]
Interest rate during period	5.26%
New Ultraco Debt Facility | Weighted Average
Debt Instrument [Line Items]
Interest rate during period	4.54%
First Lien Facility
Debt Instrument [Line Items]
Commitment fee percentage			40.00%
First Lien Facility | Minimum
Debt Instrument [Line Items]
Interest rate during period			4.77%
First Lien Facility | Maximum
Debt Instrument [Line Items]
Interest rate during period			5.35%
First Lien Facility | Weighted Average
Debt Instrument [Line Items]
Interest rate during period			6.18%
Original Ultraco Debt Facility | Minimum
Debt Instrument [Line Items]
Interest rate during period			4.19%
Original Ultraco Debt Facility | Maximum
Debt Instrument [Line Items]
Interest rate during period			4.28%
Original Ultraco Debt Facility | Weighted Average
Debt Instrument [Line Items]
Interest rate during period			4.71%