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, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Earnings Per Share [Abstract]
Net (loss) income (in dollars)	$ 10,341	$ 7,275	$ 9,816	$ 10,491
Weighted average shares outstanding (in shares)	48,221	49,873	48,477	50,341
Dilutive impact from common stock equivalents (in shares)	269	481	285	556
Diluted weighted average shares outstanding (in shares)	48,490	50,354	48,762	50,897
Basic earnings (loss) per share (in dollars per share)	$ 0.21	$ 0.15	$ 0.20	$ 0.21
Diluted earnings (loss) per share (in dollars per share)	$ 0.21	$ 0.14	$ 0.20	$ 0.21