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Earnings (Loss) Per Share (Calculation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 18,430	$ 16,746	$ 15,403	$ 12,912	$ 16,429	$ 11,172	$ 10,341	$ (525)	$ 63,491	$ 37,417	$ (55,726)
Weighted average shares outstanding (in shares)									45,561	48,129	49,481
Dilutive impact from common stock equivalents (in shares)									574	387	0
Diluted weighted average shares outstanding (in shares)									46,135	48,516	49,481
Basic earnings (loss) per share (in dollars per share)	$ 0.41	$ 0.37	$ 0.34	$ 0.28	$ 0.35	$ 0.23	$ 0.21	$ (0.01)	$ 1.39	$ 0.78	$ (1.13)
Diluted earnings (loss) per share (in dollars per share)	$ 0.41	$ 0.37	$ 0.33	$ 0.27	$ 0.34	$ 0.23	$ 0.21	$ (0.01)	$ 1.38	$ 0.77	$ (1.13)

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