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, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Earnings Per Share [Abstract]
Net (loss) income (in dollars)	$ 11,172	$ 7,576	$ 20,988	$ 18,067
Weighted average shares outstanding (in shares)	48,071	48,611	48,342	49,765
Dilutive impact from common stock equivalents (in shares)	299	524	289	545
Diluted weighted average shares outstanding (in shares)	48,370	49,135	48,631	50,310
Basic earnings (loss) per share (in dollars per share)	$ 0.23	$ 0.16	$ 0.43	$ 0.36
Diluted earnings (loss) per share (in dollars per share)	$ 0.23	$ 0.15	$ 0.43	$ 0.36