Shareholders' Equity Rollforward (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended								6 Months Ended					6 Months Ended					6 Months Ended					6 Months Ended					6 Months Ended						6 Months Ended					3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014 Preferred stock 3		Mar. 31, 2013 Preferred stock 3	Dec. 31, 2012 Preferred stock 3	Jun. 30, 2014 Common stock 3		Jun. 30, 2013 Common stock 3		Mar. 31, 2013 Common stock 3	Jun. 30, 2014 Paid-in capital 3		Jun. 30, 2013 Paid-in capital 3		Mar. 31, 2013 Paid-in capital 3	Jun. 30, 2014 Accumulated deficit 3		Jun. 30, 2013 Accumulated deficit 3		Mar. 31, 2013 Accumulated deficit 3	Jun. 30, 2014 Deferred compensation obligation		Jun. 30, 2013 Deferred compensation obligation		Mar. 31, 2013 Deferred compensation obligation	Jun. 30, 2014 Accumulated other comprehensive income 4		Jun. 30, 2013 Accumulated other comprehensive income 4		Mar. 31, 2013 Accumulated other comprehensive income 4		Jun. 30, 2014 Treasury stock		Jun. 30, 2013 Treasury stock		Mar. 31, 2013 Treasury stock	Jun. 30, 2014 Depositary Shares [Member]	Jun. 30, 2014 Convertible Preferred Stock
Schedule of Stockholders' Equity [Line Items]
Preferred Stock, Value, Issued			$ (313,646)	[1]			$ 3,250									$ 310,396
Share-based Compensation			1,651		3,771
Conversion of Stock, Shares Converted																																										262,012	2,620
Stock Issued During Period, Shares, Conversion of Convertible Securities	4,366,872
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance		895,387	788,804		895,116		1,150	[2]	1,150	1,150	466	[2]	364		465	891,351	[2]	849,046		894,447	(104,180)		45,790		519	2,792		3,111		2,663	267	[3]	(982)	[3]	(944)	[3]	(3,042)		(3,363)		(2,913)
Net loss	(100,784)	(25,438)	(81,559)		(41,821)																(81,559)
Dividends Declared			(3,440)	[1]
Dividends Declared					(3,450)	[2]																	(3,450)	[2]
All Other Changes			(1,059)	[4]	45,542	[4]	(262)	[2],[4]			46	[2],[4]	101	[4]		2,477	[2],[4]	45,401	[4]							209	[4]	(448)	[4]		49	[3],[4]	38	[3],[4]			(210)	[4]	450	[4]
As of ending balance	1,016,392		1,016,392				4,138	[2]	1,150	1,150	512	[2]			465	1,204,224	[2]			894,447	(192,547)				519	3,001				2,663	316	[3]			(944)	[3]	(3,252)				(2,913)
Preferred stock dividends	(1,718)	(1,725)	(3,440)		(3,450)																(3,440)	[1]
Preferred Stock Conversions, Inducements	$ (3,368)	$ 0	$ (3,368)		$ 0

[1] Includes dividends of $300.00 per share of our 6% Series A Convertible Perpetual Preferred Stock (the “Series A Preferred Stock”).

[2] 3 A total of 2,620 shares, or 262,012 depositary shares, of the Series A Preferred Stock were converted into 4,366,872 shares of our common stock during the six months ended June 30, 2014.

[3] The Accumulated other comprehensive income (loss) (“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, 2014 and 2013 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $75 and $58 and are presented above net of taxes of $26 and $20.

[4] Includes equity-classified share-based compensation of $1,651 and $3,771 for the six months ended June 30, 2014 and 2013.