Earnings Per Share (Calculation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Earnings Per Share [Abstract]
Net income (in dollars)	$ 5,769	$ 12,799	$ 4,798	$ 23,899
Weighted average shares outstanding (in shares)	50,342	51,049	50,505	51,271
Dilutive impact from common stock equivalents (in shares)	743	624	719	648
Diluted weighted average shares outstanding (in shares)	51,085	51,673	51,224	51,919
Basic earnings per share (in dollars per share)	$ 0.11	$ 0.25	$ 0.10	$ 0.47
Diluted earnings per share (in dollars per share)	$ 0.11	$ 0.25	$ 0.09	$ 0.46