Shareholders' Equity Rollforward (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended										3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014 Preferred stock 3		Dec. 31, 2013 Preferred stock 3		Mar. 31, 2013 Preferred stock 3	Dec. 31, 2012 Preferred stock 3	Mar. 31, 2014 Convertible Preferred Stock		Mar. 31, 2014 Common stock 3		Mar. 31, 2013 Common stock 3		Mar. 31, 2014 Paid-in capital 3		Mar. 31, 2013 Paid-in capital 3		Mar. 31, 2014 Retained earnings		Mar. 31, 2013 Retained earnings		Mar. 31, 2014 Deferred compensation obligation		Mar. 31, 2013 Deferred compensation obligation		Mar. 31, 2014 Accumulated other comprehensive income 4		Mar. 31, 2013 Accumulated other comprehensive income 4		Mar. 31, 2014 Treasury stock		Mar. 31, 2013 Treasury stock		Mar. 31, 2014 Depositary Shares [Member]
Schedule of Stockholders' Equity [Line Items]
Share-based Compensation	$ 825		$ 1,085
Conversion of Stock, Shares Converted											19.5																										1,950.0
Stock Issued During Period, Shares, Conversion of Convertible Securities	32,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	788,804		895,116		1,148	[1]	1,150	[1]	1,150	1,150			466	[1]	364		891,351	[1]	849,046		(104,180)		45,790		2,792		3,111		267	[2]	(982)	[2]	(3,042)		(3,363)
Net income (loss)	19,225		(16,383)																		19,225		(16,383)
Dividends Declared	(1,722)	[3]
Dividends Declared			(1,725)	[1]																			(1,725)	[1]
All Other Changes	1,936	[4]	685	[4]							(2)	[1],[4]	2	[1],[4]	1	[4]	1,911	[1],[4]	664	[4]					105	[4]	65	[4]	25	[2],[4]	19	[2],[4]	(105)	[4]	(64)	[4]
As of ending balance	808,243		877,693		1,148	[1]	1,150	[1]	1,150	1,150			468	[1]	365		893,262	[1]	849,710		(86,677)		27,682		2,897		3,176		292	[2]	(963)	[2]	(3,147)		(3,427)
Preferred stock dividends	$ (1,722)		$ (1,725)																		$ (1,722)	[3]

[1] 3 A total of 19.5 shares, or 1,950 depositary shares, of 6% Preferred Stock were converted into 32,500 shares of our common stock during the three months ended March 31, 2014.

[2] 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 three months ended March 31, 2014 and 2013 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $38 and $29 and are presented above net of taxes of $13 and $10.

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

[4] Includes equity-classified share-based compensation of $825 and $1,085 for the three months ended March 31, 2014 and 2013.