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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Nov. 30, 2018	Nov. 30, 2017
Numerator:
Net income for basic and diluted earnings per common share	$ 15,395	$ 11,244	$ 15,718	$ (166)	$ 9,786	$ 12,062	$ 42,357	$ 21,682
Denominator:
Denominator for basic earnings per common share-weighted average shares (shares)	26,064			25,965			26,022	25,982
Effect of dilutive securities:
Employee and Director stock awards (shares)	87			0			70	67
Denominator for diluted earnings per common share (shares)	26,151			25,965			26,092	26,049
Earnings per share basic and diluted:
Basic earnings per Common share (usd per share)	$ 0.59			$ (0.01)			$ 1.63	$ 0.83
Diluted earnings per common share (usd per share)	$ 0.59			$ (0.01)			$ 1.62	$ 0.83