Statements Of Consolidated Shareholders' Equity And Comprehensive Income (Loss) (USD $) In Thousands, except Share data, unless otherwise specified	Preferred Stock Series B [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Deferred Compensation [Member]	Retained Earnings [Member]	Repurchased Common Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2008	$ 5	$ 38,851	$ 663,910	$ (10,435)	$ 1,020,930	$ (713,095)	$ (374,574)
Balance, shares at Dec. 31, 2008	523,911	62,379,868
Net income (loss)					(107,747)			(107,747)	(107,747)
Other comprehensive income (loss):
Foreign currency translation adjustment							2,184	2,184
Employee benefit plans
Actuarial gain (loss), net of deferred tax							137,381	137,381
Prior-service credit, net of deferred tax							(745)	(745)
Unrealized gain (loss) on available-for-sale security, net of deferred tax							232	232
Comprehensive income (loss)								31,305
Exercise of stock options, including tax benefits		86	4,532
Exercise of stock options, including tax benefits, shares		137,257
Share-based compensation, net of tax		34	10,618			(110)
Share-based compensation, net of tax, shares		(4,669)
Primary DC Plan deferred compensation				10,435
Repurchased common stock issued for conversion of preferred stock			(8,913)			8,913
Repurchased common stock issued for conversion of preferred stock, shares	(30,691)
Repurchased common stock issued for redemption of preferred stock	(5)		(93,840)			93,845
Repurchased common stock issued for redemption of preferred stock, shares	(493,220)
Repurchased common stock issued for payment of preferred stock dividend			(800)			3,989
Repurchased common stock issued for 401k match			(7,923)			31,239
Common dividends declared					(19,079)
Series B, Preferred dividends					(3,189)				(3,189)
Balance at Dec. 31, 2009		38,971	567,584		890,915	(575,219)	(235,522)
Balance, shares at Dec. 31, 2009		62,512,456
Net income (loss)					3,985			3,985	3,985
Other comprehensive income (loss):
Foreign currency translation adjustment							(913)	(913)
Employee benefit plans
Actuarial gain (loss), net of deferred tax							(42,885)	(42,885)
Prior-service credit, net of deferred tax							(603)	(603)
Unrealized gain (loss) on available-for-sale security, net of deferred tax							29	29
Comprehensive income (loss)								(40,387)
Exercise of stock options, including tax benefits		104	2,958
Exercise of stock options, including tax benefits, shares		165,480
Share-based compensation, net of tax		68	11,594		(64)	(713)
Share-based compensation, net of tax, shares		73,058
Repurchased common stock issued for 401k match			(2,128)		(10,025)	48,916
Common stock offering					(42,779)	186,104
Common dividends declared					(20,845)
Balance at Dec. 31, 2010		39,143	580,008		821,187	(340,912)	(279,894)		819,532
Balance, shares at Dec. 31, 2010		62,750,994
Net income (loss)					88,443			88,443	88,443
Other comprehensive income (loss):
Foreign currency translation adjustment							(1,331)	(1,331)
Employee benefit plans
Actuarial gain (loss), net of deferred tax							(156,475)	(156,475)
Prior-service credit, net of deferred tax							(730)	(730)
Unrealized gain (loss) on available-for-sale security, net of deferred tax							(6)	(6)
Comprehensive income (loss)								(70,099)
Exercise of stock options, including tax benefits		153	6,008
Exercise of stock options, including tax benefits, shares		244,944							244,944
Share-based compensation, net of tax		98	9,976		(73)	(1,471)
Share-based compensation, net of tax, shares		69,993
Repurchased common stock issued for 401k match					(2,622)	19,929
Common dividends declared					(22,177)
Balance at Dec. 31, 2011		$ 39,394	$ 595,992		$ 884,758	$ (322,454)	$ (438,436)		$ 759,254
Balance, shares at Dec. 31, 2011		63,065,931