Bankruptcy Related Disclosures - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands		4 Months Ended	12 Months Ended
	Aug. 31, 2017	Dec. 31, 2017	Dec. 31, 2017
Schedule of Reorganization Items, Net [Line Items]
Proceeds from issuance of debt		$ 22,973,000
Reorganization shares issued to debt holders (in shares)	2,000
Reorganization shares, par value (in dollars per share)	$ 0.01
Put Option Fee	$ 2,000,000
Enterprise value	244,000,000	244,000,000	$ 244,000,000
Postpetition liabilities	$ 404,000,000
Minimum
Schedule of Reorganization Items, Net [Line Items]
Enterprise value		234,000,000	234,000,000
Maximum
Schedule of Reorganization Items, Net [Line Items]
Enterprise value		$ 264,000,000	$ 264,000,000
Common Shares
Schedule of Reorganization Items, Net [Line Items]
Reorganization shares issued to debt holders (in shares)	400
Warrants Not Settleable in Cash
Schedule of Reorganization Items, Net [Line Items]
Discount rate (as a percent)			11.10%
11.0% Senior Secured Term Loan Credit Facilities due September 14, 2018
Schedule of Reorganization Items, Net [Line Items]
Stated interest rate (as a percent)	11.00%	11.00%	11.00%
12.75% Senior Secured Notes due December 15, 2018
Schedule of Reorganization Items, Net [Line Items]
Stated interest rate (as a percent)	12.75%	12.75%	12.75%
5.25% Convertible Notes due December 30, 2019
Schedule of Reorganization Items, Net [Line Items]
Stated interest rate (as a percent)	5.25%	5.25%	5.25%
Cash received from initial draw on New ABL Facility | Line of Credit
Schedule of Reorganization Items, Net [Line Items]
Line of credit capacity	$ 125,000,000
New Money Notes | Senior Notes
Schedule of Reorganization Items, Net [Line Items]
Proceeds from issuance of debt			$ 38,002,000
Aggregate principal amount	47,502,000
Second Lien Notes | Senior Notes
Schedule of Reorganization Items, Net [Line Items]
Aggregate principal amount	162,502,000
Repayments of debt	$ 6,646,000
Second Lien Notes | Minimum | Senior Notes
Schedule of Reorganization Items, Net [Line Items]
Stated interest rate (as a percent)	500.00%
Second Lien Notes | Maximum | Senior Notes
Schedule of Reorganization Items, Net [Line Items]
Stated interest rate (as a percent)	7.00%
Prepetition Second Lien Secured Claims | Senior Notes
Schedule of Reorganization Items, Net [Line Items]
Aggregate principal amount	$ 111,875,000
Prepetition Second Lien Secured Claims | Secured Debt
Schedule of Reorganization Items, Net [Line Items]
Reorganization shares issued to debt holders (in shares)	1,300
Prepetition Third Lien Secured Claims | Senior Notes
Schedule of Reorganization Items, Net [Line Items]
Aggregate principal amount	$ 3,125,000
Prepetition Third Lien Secured Claims | Secured Debt
Schedule of Reorganization Items, Net [Line Items]
Reorganization shares issued to debt holders (in shares)	300