CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common stock [Member]	Additional paid-in capital [Member]	Accumulated other comprehensive income (loss) Pensions [Member]	Accumulated Other Comprehensive Income (Loss) [Member] OPEB [Member]	Retained earnings [Member]
Beginning balance at Dec. 31, 2012	$ 177,403	$ 121	$ 99,024	$ (179,731)	$ 2,689	$ 255,300
Net income	6,667					6,667
Other comprehensive income (loss), net	1,367			2,681	(1,314)
Ending balance at Mar. 31, 2013	$ 185,437	$ 121	$ 99,024	$ (177,050)	$ 1,375	$ 261,967