Stock Options and Incentive Plans (Schedule of Stock Option Activity) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Options and Incentive Plans [Abstract]
Shares under option	597,313	639,163	651,143
Options canceled	23,300	400	4,750
Options exercised	66,700	41,450	7,230
Shares under option at December 31	507,313	597,313	639,163
Options exercisable at December 31	507,313	597,313	639,163