Fair Value Measurements (Details) - USD ($)		6 Months Ended
	Feb. 08, 2019	Jun. 30, 2019	Dec. 31, 2018
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Principal amount		$ 130,000,000	$ 334,473,000
Exit Facility
Derivatives, Fair Value [Line Items]
Discounted cash flow, credit spread percent	10.10%	10.10%
10% Secured PIK Notes due 2024
Derivatives, Fair Value [Line Items]
Discounted cash flow, credit spread percent	11.90%	11.90%
Senior Notes | 10% Senior Secured Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Principal amount		$ 0	9,427,000
Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Principal amount		0	275,046,000
Payment in Kind (PIK) Note | 10% Secured PIK Notes due 2024
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Principal amount	$ 80,000,000	80,000,000	0
Fair Value
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		110,294,000	135,342,000
Fair Value | Senior Notes | 10% Senior Secured Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		0	2,828,000
Fair Value | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		0	82,514,000
Fair Value | Payment in Kind (PIK) Note | 10% Secured PIK Notes due 2024
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		65,025,000	0
Carrying Value
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		114,426,000	334,211,000
Carrying Value | Senior Notes | 10% Senior Secured Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		0	9,427,000
Carrying Value | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		0	275,046,000
Carrying Value | Payment in Kind (PIK) Note | 10% Secured PIK Notes due 2024
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		68,699,000	0
Term Loan | Line of Credit | Multidraw Term Loan Agreement
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Principal amount		0	50,000,000
Term Loan | Line of Credit | Exit Facility
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Principal amount		50,000,000	0
Term Loan | Fair Value | Line of Credit | Multidraw Term Loan Agreement
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		0	50,000,000
Term Loan | Fair Value | Line of Credit | Exit Facility
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		45,269,000	0
Term Loan | Carrying Value | Line of Credit | Multidraw Term Loan Agreement
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		0	49,738,000
Term Loan | Carrying Value | Line of Credit | Exit Facility
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value		$ 45,727,000	$ 0