Shareholders' Equity Rollforward (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Stockholders' Equity [Line Items]
Preferred Stock, Value, Issued	[1]			$ 0	$ 313,646
Share-based Compensation				2,106	1,651
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				675,817	788,804
Net loss		$ (80,129)	$ (100,784)	(137,294)	(81,559)
Dividends Declared	[1]			(12,134)
Dividends Declared					(3,440)
All Other Changes	[2]			1,529	(1,059)
As of ending balance		527,918	1,016,392	527,918	1,016,392
Preferred stock dividends	[3]	(6,067)	(1,718)	(12,134)	(3,440)
Induced conversion of preferred stock		0	(3,368)	0	(3,368)
Preferred stock
Schedule of Stockholders' Equity [Line Items]
Preferred Stock, Value, Issued					(3,250)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				4,044	1,150
All Other Changes	[2]			0	(262)
As of ending balance		4,044	4,138	4,044	4,138
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				529	466
All Other Changes	[2]			1	46
As of ending balance		530	512	530	512
Paid-in capital
Schedule of Stockholders' Equity [Line Items]
Preferred Stock, Value, Issued					(310,396)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				1,206,305	891,351
All Other Changes	[2]			1,549	2,477
As of ending balance		1,207,854	1,204,224	1,207,854	1,204,224
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				(535,176)	(104,180)
Net loss				(137,294)
As of ending balance		(684,604)	(192,547)	(684,604)	(192,547)
Preferred stock dividends	[1]			(12,134)	(3,440)
Deferred compensation obligation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				3,211	2,792
All Other Changes	[2]			143	209
As of ending balance		3,354	3,001	3,354	3,001
Accumulated other comprehensive income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	[4]			249	267
All Other Changes	[4]			(21)	49
As of ending balance	[4]	228	316	228	316
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance				(3,345)	(3,042)
All Other Changes	[2]			(143)	(210)
As of ending balance		$ (3,488)	$ (3,252)	$ (3,488)	$ (3,252)
Series A Preferred Stock
Schedule of Stockholders' Equity [Line Items]
Number of shares on which dividends were declared during the period				7,945	11,480
Series B Preferred Stock
Schedule of Stockholders' Equity [Line Items]
Number of shares on which dividends were declared during the period				32,500

[1] Includes dividends of $300.00 per share on 7,945 and 11,480 shares of our 6% Series A Convertible Perpetual Preferred Stock (the “Series A Preferred Stock”) during the six months ended June 30, 2015 and 2014, respectively, and $300.00 per share on 32,500 shares of our 6% Series B Convertible Perpetual Preferred Stock (the “Series B Preferred Stock”) for the six months ended June 30, 2015.

[2] Includes equity-classified share-based compensation of $2,106 and $1,651 for the six months ended June 30, 2015 and 2014.

[3] Preferred stock dividends were excluded from the computation of diluted earnings per share as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.

[4] 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 six months ended June 30, 2015 and 2014 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $(32) and $75 and are presented above net of taxes of $(11) and $26.