Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other comprehensive income:
Change in pension benefit plans, tax expense (benefit)	$ (7,759)	$ (1,891)	$ 792
Common stock, dividend declared (in dollars per share)		$ 1.00