Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Aug. 31, 2019	May 31, 2019	Aug. 31, 2018	May 31, 2018	Aug. 31, 2019	Aug. 31, 2018
Numerator:
Net income for basic and diluted earnings per common share	$ 15,558	$ 21,284	$ 11,244	$ 15,718	$ 36,842	$ 26,962
Denominator:
Denominator for basic earnings per common share-weighted average shares (shares)	26,197		26,019		26,161	26,001
Effect of dilutive securities:
Employee and Director stock awards (shares)	75		72		72	61
Denominator for diluted earnings per common share (shares)	26,272		26,091		26,233	26,062
Earnings per share basic and diluted:
Basic earnings per Common share (usd per share)	$ 0.59		$ 0.43		$ 1.41	$ 1.04
Diluted earnings per common share (usd per share)	$ 0.59		$ 0.43		$ 1.40	$ 1.03

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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