Shareholders' Equity Rollforward (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015
Schedule of Stockholders' Equity [Line Items]
Share-based compensation				$ (3,922)	[1]	$ 2,106
Stock Issued During Period, Shares, Conversion of Convertible Securities				85,982		6,879,222
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				$ (915,121)		$ 675,817
Net loss		$ (61,980)	$ (80,129)	(95,453)		(137,294)
Dividends Declared				0
Dividends Declared						(12,134)
All Other Changes	[1]			(3,960)		1,529
As of ending balance		(1,014,534)	527,918	(1,014,534)		527,918
Preferred stock dividends	[2]	(2,820)	(6,067)	(5,972)		(12,134)
Preferred stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				3,146		4,044
All Other Changes	[1]			(1,266)		0
As of ending balance		1,880	4,044	1,880		4,044
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				628		529
All Other Changes	[1]			69		1
As of ending balance		697	530	697		530
Paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				1,211,088		1,206,305
All Other Changes	[1]			(2,725)		1,549
As of ending balance		1,208,363	1,207,854	1,208,363		1,207,854
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				(2,130,271)		(535,176)
Net loss				(95,453)
All Other Changes	[1]					0
As of ending balance		(2,225,724)	(684,604)	(2,225,724)		(684,604)
Preferred stock dividends						(12,134)
Deferred compensation obligation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				3,440		3,211
All Other Changes	[1]			0		143
As of ending balance		3,440	3,354	3,440		3,354
Accumulated other comprehensive income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	[3]			422		249
All Other Changes	[3]			(38)		(21)
As of ending balance	[3]	384	228	384		228
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				(3,574)		(3,345)
All Other Changes	[1]			0		(143)
As of ending balance		$ (3,574)	$ (3,488)	$ (3,574)		$ (3,488)
Series A Preferred Stock
Schedule of Stockholders' Equity [Line Items]
Preferred stock dividends (in dollars per share)						$ 300.00
Series B Preferred Stock
Schedule of Stockholders' Equity [Line Items]
Preferred stock dividends (in dollars per share)						$ 300.00
Convertible Preferred Stock
Schedule of Stockholders' Equity [Line Items]
Conversion of Stock, Shares Converted				52		12,619

[1] Includes equity-classified share-based compensation of $(3,922) and $2,106 for the six months ended June 30, 2016 and 2015, respectively.

[2] Preferred stock dividends were excluded from the computation of diluted earnings (loss) per share for the three and six months ended June 30, 2016 and 2015, as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.

[3] 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 six months ended June 30, 2016 and 2015 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $(38) and $(21), respectively, and are presented above net of taxes of $(11) in the 2015 period.