Compensation Plans (Details 2) (USD $) In Thousands, except Per Share data	9 Months Ended
	Aug. 31, 2011	Aug. 31, 2011	Dec. 31, 2010
Summary of stock option activity
Options outstanding at beginning balance			26
Options Outstanding, Weighted Average Exercise Price, beginning balance		$ 11.44	$ 9.89
Options Exercised	(12)
Options, weighted average exercised	$ 8.03
Options outstanding at end of period	14		26
Options Outstanding, Weighted Average Exercise Price, ending balance	$ 11.44
Options exercisable at end of period	14
Options exercisable, Weighted Average Exercise Price, end of period	$ 11.44