Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Numerator:
Net income for basic and diluted earnings per common share	$ 8,329	$ 10,023	$ 21,569	$ 31,086
Denominator:
Denominator for basic earnings per common share-weighted average shares (shares)	25,970	25,987	25,991	25,950
Effect of dilutive securities:
Employee and Director stock awards (shares)	66	132	74	131
Denominator for diluted earnings per common share (shares)	26,036	26,119	26,065	26,081
Earnings per share basic and diluted:
Basic earnings per Common share (usd per share)	$ 0.32	$ 0.39	$ 0.83	$ 1.20
Diluted earnings per common share (usd per share)	$ 0.32	$ 0.38	$ 0.83	$ 1.19