Condensed Consolidated Statement Of Stockholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) Pensions [Member]	Accumulated Other Comprehensive Income (Loss) OPEB [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2011	$ 121	$ 99,024	$ (192,552)	$ 10,459	$ 235,076	$ 152,128
Net income					7,265	7,265
Other comprehensive income (loss), net			2,868	(1,283)		1,585
Balance at Mar. 31, 2012	$ 121	$ 99,024	$ (189,684)	$ 9,176	$ 242,341	$ 160,978