Condensed Combined Debtor In Possession Financial Information Debtors' Statement of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ (33,350)	$ (24,446)
Capital expenditures	(2,264)	(1,912)
Proceeds from Sale of Property, Plant, and Equipment	47	2,836
Change in cash collateralization of letters of credit	246	0
Net Cash Provided by (Used in) Investing Activities	(1,971)	54,494
Proceeds from long-term debt	12,500	426,861
Repayments of long-term debt	(126)	(447,185)
Net cash from (used in) financing activities	10,543	(29,238)
Cash and Cash Equivalents, Period Increase (Decrease)	(24,404)	755
Cash and cash equivalents - beginning of period	35,624	11,100
Cash and cash equivalents - end of period	11,220	$ 11,855
Debtors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	(29,641)
Capital expenditures	(1,933)
Change in cash collateralization of letters of credit	246
Net Cash Provided by (Used in) Investing Activities	(1,687)
Proceeds from long-term debt	12,500
Repayments of long-term debt	(114)
Other financing activities	(1,831)
Net cash from (used in) financing activities	10,555
Cash and Cash Equivalents, Period Increase (Decrease)	(20,773)
Cash and cash equivalents - beginning of period	25,339
Cash and cash equivalents - end of period	$ 4,566