Stockholders' Equity (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity Note [Abstract]
Authorized number of common shares to purchase, maximum	4,000,000
Shares repurchased during period	0	0	0
Number of treasury shares held	60,000	56,000
Average cost of treasury stock, per share	$ 10.98	$ 11.77