Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Numerator:
Net income for basic and diluted earnings per common share	$ (166)	$ 16,646	$ 21,682	$ 48,994
Denominator:
Denominator for basic earnings per common share-weighted average shares (shares)	25,965	26,005	25,982	25,974
Effect of dilutive securities:
Employee and Director stock awards (shares)	0	128	67	130
Denominator for diluted earnings per common share (shares)	25,965	26,133	26,049	26,104
Earnings per share basic and diluted:
Basic earnings per Common share (usd per share)	$ (0.01)	$ 0.64	$ 0.83	$ 1.89
Diluted earnings per common share (usd per share)	$ (0.01)	$ 0.64	$ 0.83	$ 1.88

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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