Consolidated Balance Sheet (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Preferred stock (dollars per share)	$ 0.10	$ 0.10
Preferred shares authorized (in shares)	10,000,000	10,000,000
Common stock (dollars per share)	$ 0.10	$ 0.10
Common shares authorized (in shares)	100,000,000	100,000,000
Common shares issued (in shares)	18,793,649	18,721,474
Common stock outstanding (in shares)	16,183,442	18,027,903
Common stock in treasury (in shares)	2,610,207	693,571