Earnings Per Share (Details) (USD $) In Thousands, except Share data	3 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Weighted-average shares outstanding for basic and diluted net income per share
Net income	$ 18,983	$ 12,092
Basic net income per share:
Weighted-average shares outstanding - Basic	29,181,000	28,896,000
Basic net income per common share	$ 0.65	$ 0.42
Diluted net income per share:
Weighted-average shares outstanding - Basic	29,181,000	28,896,000
Effect of potentially dilutive securities	219,000	161,000
Weighted-average shares outstanding - Diluted	29,400,000	29,057,000
Diluted net income per common share	$ 0.65	$ 0.42
Earnings Per Share (Textuals)
Options excluded from the computation of diluted net income per share	78	253

Earnings per share.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.

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

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The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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The sum of dilutive potential common shares used in the calculation of the diluted per-share computation.

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The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.

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

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