Shareholders' Equity Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Schedule of Stockholders' Equity [Line Items]
Share-based Compensation	$ 990		$ 825
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	675,817		788,804
Net income (loss)	(57,165)		19,225
Dividends Declared	(6,067)	[1]
Dividends Declared			(1,722)
All Other Changes	979	[2]	1,936	[2]
As of ending balance	613,564		808,243
Preferred stock dividends	(6,067)		(1,722)
Preferred stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	4,044		1,150
All Other Changes	0	[2]	(2)	[2]
As of ending balance	4,044		1,148
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	529		466
All Other Changes	0	[2]	2	[2]
As of ending balance	529		468
Paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	1,206,305		891,351
All Other Changes	989	[2]	1,911	[2]
As of ending balance	1,207,294		893,262
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	(535,176)		(104,180)
Net income (loss)	(57,165)
As of ending balance	(598,408)		(86,677)
Preferred stock dividends	(6,067)	[1]	(1,722)	[1]
Deferred compensation obligation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	3,211		2,792
All Other Changes	56	[2]	105	[2]
As of ending balance	3,267		2,897
Accumulated other comprehensive income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	249	[3]	267	[3]
All Other Changes	(11)	[3]	25	[3]
As of ending balance	238	[3]	292	[3]
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	(3,345)		(3,042)
All Other Changes	(55)	[2]	(105)	[2]
As of ending balance	$ (3,400)		$ (3,147)

[1] Includes dividends of $150.00 per share on our 6% Series A Convertible Perpetual Preferred Stock (the “Series A Preferred Stock”) and $150.00 per share on our 6% Series B Convertible Perpetual Preferred Stock (the “Series B Preferred Stock”).

[2] Includes equity-classified share-based compensation of $990 and $825 for the three months ended March 31, 2015 and 2014.

[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 three months ended March 31, 2015 and 2014 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $(17) and $38 and are presented above net of taxes of $(6) and $13.