Earnings Per Share (Calculation of Basic and Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Earnings Per Share [Abstract]
Income from continuing operations (in dollars)	$ 8,142	$ 8,855	$ 17,955	$ 24,715
Weighted average shares outstanding	54,919	63,051	56,410	62,598
Dilutive impact from common stock equivalents	817	0	834	1,043
Diluted weighted average shares outstanding	55,736	63,051	57,244	63,641
Basic earnings per share from continuing operations (in dollars per share)	$ 0.15	$ 0.14	$ 0.32	$ 0.39
Diluted earnings per share from continuing operations (in dollars per share)	$ 0.15	$ 0.14	$ 0.31	$ 0.39