Shareholders' Equity Rollforward (Details) - USD ($)		1 Months Ended	2 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
		Sep. 30, 2016	Sep. 12, 2016	Sep. 30, 2015	Sep. 12, 2016	Sep. 30, 2016	Sep. 30, 2015
Schedule of Stockholders' Equity [Line Items]
Issuance of Common Stock, Exchange of Claims			$ 131,893,000		$ 131,893,000
Issuance of Common Stock, Backstop Fee			9,059,000		9,059,000
Issuance of Common Stock, Rights Offering			49,943,000		49,943,000
Share-based compensation		$ 0			1,511,000	$ 3,918,000	$ 3,369,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance					915,121,000	915,121,000
Net income (loss)		(3,441,000)	1,150,055,000	$ 25,900,000	1,054,602,000		$ (111,394,000)
All Other Changes					(1,473,000)
As of ending balance		(187,454,000)				(187,454,000)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax						0
Preconfirmation, Liabilities and Stockholders' Equity			(140,954,000)		(140,954,000)
Cancellation of Equity Upon Emergence from Bankruptcy			882,992,000		882,992,000
Cancellation of Total Equity Upon Emergence from Bankruptcy			(140,954,000)		(140,954,000)
Postconfirmation, Stockholders' Equity			190,895,000		190,895,000
Preferred stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance					(3,146,000)	(3,146,000)
All Other Changes					1,266,000
As of ending balance		0				0
Preconfirmation, Liabilities and Stockholders' Equity			(1,880,000)		(1,880,000)
Cancellation of Equity Upon Emergence from Bankruptcy			(1,880,000)		(1,880,000)
Postconfirmation, Stockholders' Equity			0		0
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance					(628,000)	(628,000)
All Other Changes					(69,000)
As of ending balance		(150,000)				(150,000)
Preconfirmation, Liabilities and Stockholders' Equity			(697,000)		(697,000)
Cancellation of Equity Upon Emergence from Bankruptcy			(697,000)		(697,000)
Postconfirmation, Common Stock - Rights Offering			76,000		76,000
Postconfirmation, Common Stock			69,000		69,000
Postconfirmation, Additional Paid-in Capital			131,824,000		131,824,000
Postconfirmation, Stockholders' Equity			150,000		150,000
Postconfirmation, Common Stock - Backstop Fee			5,000		5,000
Postconfirmation, Additional Paid-in Capital - Rights Offering			49,867,000		49,867,000
Postconfirmation, Additional paid-in capital - Backstop Fee			9,054,000		9,054,000
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance					(1,211,088,000)	(1,211,088,000)
All Other Changes					(2,709,000)
As of ending balance		(190,745,000)				(190,745,000)
Preconfirmation, Liabilities and Stockholders' Equity			(1,213,797,000)		(1,213,797,000)
Cancellation of Equity Upon Emergence from Bankruptcy			(1,213,797,000)		(1,213,797,000)
Postconfirmation, Stockholders' Equity			190,745,000		190,745,000
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance		0			2,130,271,000	2,130,271,000
Net income (loss)		(3,441,000)			1,054,602,000
As of ending balance		3,441,000	0		0	3,441,000
Preconfirmation, Liabilities and Stockholders' Equity			1,075,669,000		1,075,669,000
Cancellation of Equity Upon Emergence from Bankruptcy			1,075,669,000		1,075,669,000
Postconfirmation, Stockholders' Equity			0		0
Deferred compensation obligation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance					(3,440,000)	(3,440,000)
All Other Changes						0
As of ending balance		0				0
Preconfirmation, Liabilities and Stockholders' Equity			(3,440,000)		(3,440,000)
Cancellation of Equity Upon Emergence from Bankruptcy			(3,440,000)		(3,440,000)
Postconfirmation, Stockholders' Equity			0		0
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance					(422,000)	(422,000)
All Other Changes					39,000
As of ending balance		0				0
Preconfirmation, Liabilities and Stockholders' Equity	[1]		(383,000)		(383,000)
Cancellation of Equity Upon Emergence from Bankruptcy	[1]		(383,000)		(383,000)
Postconfirmation, Stockholders' Equity	[1]		0		0
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance					(3,574,000)	(3,574,000)
All Other Changes						0
As of ending balance		$ 0				$ 0
Preconfirmation, Liabilities and Stockholders' Equity			(3,574,000)		(3,574,000)
Cancellation of Equity Upon Emergence from Bankruptcy			3,574,000		3,574,000
Postconfirmation, Stockholders' Equity			$ 0		$ 0
Convertible Preferred Stock
Schedule of Stockholders' Equity [Line Items]
Conversion of Stock, Shares Converted						52	12,619
Depositary Shares
Schedule of Stockholders' Equity [Line Items]
Conversion of Stock, Shares Converted						5,159	1,261,850
Preferred Stock, Dividend Rate, Percentage						6.00%
Series A Preferred Stock Converted to Common [Member] | Common stock
Schedule of Stockholders' Equity [Line Items]
Stock Issued During Period, Shares, Conversion of Convertible Securities					85,982
Series B Preferred Stock Converted to Common [Member] | Common stock
Schedule of Stockholders' Equity [Line Items]
Stock Issued During Period, Shares, Conversion of Convertible Securities					6,879,222

[1] Accumulated other comprehensive income (“AOCI”) is entirely attributable to our defined benefit pension and postretirement health care plans. The changes in the balance of AOCI for the period January 1, 2016 through September 12, 2016, represent reclassifications from AOCI to net periodic benefit expense, a component of “General and administrative expenses,” of $(38).