Shareholders' Equity Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2013 Preferred stock	Dec. 31, 2012 Preferred stock	Mar. 31, 2013 Common stock	Mar. 31, 2012 Common stock	Mar. 31, 2013 Paid-in capital	Mar. 31, 2012 Paid-in capital	Mar. 31, 2013 Retained earnings		Mar. 31, 2012 Retained earnings		Mar. 31, 2013 Deferred compensation obligation	Mar. 31, 2012 Deferred compensation obligation	Mar. 31, 2013 Accumulated other comprehensive loss 2		Mar. 31, 2012 Accumulated other comprehensive loss 2		Mar. 31, 2013 Treasury stock	Mar. 31, 2012 Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	$ 895,116		$ 846,309		$ 1,150	$ 1,150	$ 364	$ 270	$ 849,046	$ 690,131	$ 45,790		$ 157,242		$ 3,111	$ 3,620	$ (982)	[1]	$ (1,084)	[1]	$ (3,363)	$ (3,870)
Net loss	(16,383)		(11,899)								(16,383)		(11,899)
Dividends Declared	(1,725)	[2]
Dividends Declared			(2,586)	[3]									(2,586)	[3]
All Other Changes	685		1,637				1	1	664	1,614					65	40	19	[1]	23	[1]	(64)	(41)
As of ending balance	877,693		833,461		1,150	1,150	365	271	849,710	691,745	27,682		142,757		3,176	3,660	(963)	[1]	(1,061)	[1]	(3,427)	(3,911)
Preferred stock dividends	$ (1,725)		$ 0								$ (1,725)	[2]

[1] The Accumulated other comprehensive loss ("AOCL") is entirely attributable to our defined benefit pension and postretirement health care plans. The changes in the balance of AOCL for the three months ended March 31, 2013 and 2012 represent reclassifications from AOCL to net periodic benefit expense, a component of General and administrative expenses, of $29 and $36 and are presented above net of taxes of $10 and $13.

[2] Includes dividends of $150.00 per share of 6% Convertible Perpetual Preferred Stock (the “6% Preferred Stock”).

[3] Includes dividends of $0.05625 per share of common stock.