Debt - TPG Term Loan - Amendments (Details) - Term Loan - TPG Term Loan - USD ($)					1 Months Ended	2 Months Ended	10 Months Ended	12 Months Ended
	Feb. 06, 2017	Dec. 19, 2016	Aug. 22, 2016	Jun. 28, 2016	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2018	Dec. 31, 2016
Debt Instrument [Line Items]
Reserve against borrowing base availability		$ 12,500,000	$ 12,500,000
Reserve against borrowing base after Form 10-Q is filed			7,500,000
Amendment fee			$ 3,000,000		$ 6,100,000	$ 5,100,000		$ 11,400,000
Prepayment right notice period		10 days
Waiver fee amount		$ 2,300,000
Legal fees		$ 400,000
Debt default, basis spread on interest rate	2.00%			2.00%
Principal amount of loan with amendment fees	$ 71,400,000
Debt instrument, face amount				$ 60,000,000.0
Forecast
Debt Instrument [Line Items]
Amendment fee							$ 8,400,000