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, 2015	Aug. 31, 2014	Aug. 31, 2015	Aug. 31, 2014
Earnings Per Share [Abstract]
Net (loss) income (in dollars)	$ (4,126)	$ 11,095	$ 670	$ 34,994
Weighted average shares outstanding (in shares)	50,120	50,383	50,377	50,975
Dilutive impact from common stock equivalents (in shares)	0	548	740	615
Diluted weighted average shares outstanding (in shares)	50,120	50,931	51,117	51,590
Basic (loss) earnings per share (in dollars per share)	$ (0.08)	$ 0.22	$ 0.01	$ 0.69
Diluted (loss) earnings per share (in dollars per share)	$ (0.08)	$ 0.22	$ 0.01	$ 0.68