Shareholders' Equity Rollforward (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended					9 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Apr. 24, 2013	Sep. 30, 2014 Preferred stock		Sep. 30, 2013 Preferred stock	Dec. 31, 2012 Preferred stock	Sep. 30, 2014 Common stock		Sep. 30, 2013 Common stock		Sep. 30, 2014 Paid-in capital		Sep. 30, 2013 Paid-in capital		Sep. 30, 2014 Accumulated deficit		Sep. 30, 2013 Accumulated deficit		Sep. 30, 2014 Deferred compensation obligation		Sep. 30, 2013 Deferred compensation obligation		Sep. 30, 2014 Accumulated other comprehensive income		Sep. 30, 2013 Accumulated other comprehensive income		Sep. 30, 2014 Treasury stock		Sep. 30, 2013 Treasury stock		Sep. 30, 2014 Depositary Shares	Sep. 30, 2014 Convertible Preferred Stock
Schedule of Stockholders' Equity [Line Items]
Stock Issued during period, Fair Value per Share, Acquisitions									$ 4.23
Preferred Stock, Value, Issued					$ (313,330)	[1]				$ 3,250								$ 310,080
Share-based Compensation					2,638		4,781
Conversion of Stock, Shares Converted																																						355,482	3,555
Stock Issued During Period, Shares, Conversion of Convertible Securities					5,924,706
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance					788,804		895,116			1,150	[2]	1,150	1,150	466	[2]	364		891,351	[2]	849,046		(104,180)		45,790		2,792		3,111		267	[3]	(982)	[3]	(3,042)		(3,363)
Net income (loss)	89,661		(98,900)		8,102		(140,721)															8,102
Dividends Declared					(11,081)	[1]
Dividends Declared							(5,175)	[2]																(5,175)	[2]
All Other Changes					(488)	[4]	46,563	[4]		(356)	[2],[4]			62	[2],[4]	101	[4],[5]	3,871	[2],[4]	46,404	[4],[5]					314	[4]	(384)	[4]	74	[3],[4]	56	[3],[4]	(197)	[4]	386	[4]
As of ending balance	1,098,667		795,783		1,098,667		795,783			4,044	[2]	1,150	1,150	528	[2]	465		1,205,302	[2]	895,450		(111,415)		(100,106)		3,106		2,727		341	[3]	(926)	[3]	(3,239)		(2,977)
Preferred stock dividends	(7,641)	[6]	(1,725)	[6]	(11,081)	[6]	(5,175)	[6]														(11,081)	[1]
Preferred Stock Conversions, Inducements	$ (888)		$ 0		$ (4,256)		$ 0

[1] Includes dividends of $450.00 per share on our 6% Series A Convertible Perpetual Preferred Stock (the “Series A Preferred Stock”) and $198.33 per share on our 6% Series B Convertible Perpetual Preferred Stock (the “Series B Preferred Stock”).

[2] A total of 3,555 shares, or 355,482 depositary shares, of the Series A Preferred Stock were converted into 5,924,706 shares of our common stock during the nine months ended September 30, 2014. We made payments of $4.3 million to induce the conversion of 3,527 of these shares.

[3] The 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 nine months ended September 30, 2014 and 2013 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $114 and $86 and are presented above net of taxes of $40 and $30.

[4] Includes equity-classified share-based compensation of $2,638 and $4,781 for the nine months ended September 30, 2014 and 2013.

[5] Includes the Shares, with a fair value of $4.23 per share, that were issued to MHR in connection with the EF Acquisition.

[6] Preferred stock dividends and payments to induce the conversion of preferred stock were excluded from diluted earnings per share for the nine months ended September 30, 2014 and the three and nine months ended September 30, 2013 as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.