Consolidated Statements Of Stockholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) Pensions [Member]	Defined Benefit OPEB Plans [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2008	$ 125	$ 100,111	$ (193,258)	$ 32,843	$ 202,275	$ (796)	$ 141,300
Balance, shares at Dec. 31, 2008	12,102
Net income (loss)					(9,424)		(9,424)
Other comprehensive income (loss), net			34,857	(6,972)			27,885
Balance at Dec. 31, 2009	125	100,111	(158,401)	25,871	192,851	(796)	159,761
Balance, shares at Dec. 31, 2009	12,102
Net income (loss)					12,014		12,014
Other comprehensive income (loss), net			41,656	(6,433)			35,223
Balance at Dec. 31, 2010	125	100,111	(116,745)	19,438	204,865	(796)	206,998
Balance, shares at Dec. 31, 2010	12,102
Net income (loss)					30,211		30,211
Retirement of treasury stock	(4)	(1,248)				796	(456)
Other comprehensive income (loss), net			(75,807)	(8,979)			(84,786)
Other, net		161					161
Balance at Dec. 31, 2011	$ 121	$ 99,024	$ (192,552)	$ 10,459	$ 235,076		$ 152,128
Balance, shares at Dec. 31, 2011	12,102