Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Accumulated Other Comprehensive Income (Loss) OPEB [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) Pensions [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2011	$ 152,128	$ 10,459	$ 121	$ 99,024	$ (192,552)	$ 235,076
Net income	14,586					14,586
Other comprehensive income (loss), net	3,172	(2,565)			5,737
Balance at Jun. 30, 2012	$ 169,886	$ 7,894	$ 121	$ 99,024	$ (186,815)	$ 249,662