Earnings Per Share (Calculation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Feb. 28, 2019	Feb. 28, 2018
Earnings Per Share [Abstract]
Net income	$ 9,402	$ 13,732	[1]
Weighted average shares outstanding (in shares)	44,956	46,529	[1]
Dilutive impact from common stock equivalents (in shares)	330	947
Diluted weighted average shares outstanding (in shares)	45,286	47,476	[1]
Basic earnings per share (in dollars per share)	$ 0.21	$ 0.30	[1]
Diluted earnings per share (in dollars per share)	$ 0.21	$ 0.29	[1]

[1] The Company adopted ASC 606 effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Basis of Presentation for further information.