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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, 2020	Aug. 31, 2020	May 31, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Nov. 30, 2020	Nov. 30, 2019
Numerator:
Net income for basic and diluted earnings per common share	$ 19,703	$ (1,790)	$ 5,541	$ 22,035	$ 15,558	$ 21,284	$ 23,454	$ 58,877
Denominator:
Denominator for basic earnings per common share-weighted average shares (shares)	25,936			26,234			26,090	26,185
Effect of dilutive securities:
Employee and Director stock awards (shares)	115			29			87	61
Denominator for diluted earnings per common share (shares)	26,051			26,263			26,177	26,246
Earnings per share basic and diluted:
Basic earnings per common share (usd per share)	$ 0.76			$ 0.84			$ 0.90	$ 2.25
Diluted earnings per common share (usd per share)	$ 0.76			$ 0.84			$ 0.90	$ 2.24