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, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Earnings Per Share [Abstract]
Income from continuing operations (in dollars)	$ 12,799	$ 8,142	$ 23,899	$ 17,955
Weighted average shares outstanding (in shares)	51,049	54,919	51,271	56,410
Dilutive impact from common stock equivalents (in shares)	624	817	648	834
Diluted weighted average shares outstanding (in shares)	51,673	55,736	51,919	57,244
Basic earnings per share from continuing operations (in dollars per share)	$ 0.25	$ 0.15	$ 0.47	$ 0.32
Diluted earnings per share from continuing operations (in dollars per share)	$ 0.25	$ 0.15	$ 0.46	$ 0.31