Earnings Per Share (Calculation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Earnings Per Share [Abstract]
Net (loss) income (in dollars)	$ 7,576	$ (4,126)	$ 18,067	$ 670
Weighted average shares outstanding (in shares)	48,611	50,120	49,765	50,377
Dilutive impact from common stock equivalents (in shares)	524	0	545	740
Diluted weighted average shares outstanding (in shares)	49,135	50,120	50,310	51,117
Basic earnings (loss) per share (in dollars per share)	$ 0.16	$ (0.08)	$ 0.36	$ 0.01
Diluted earnings (loss) per share (in dollars per share)	$ 0.15	$ (0.08)	$ 0.36	$ 0.01