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Earnings Per Share (Computation of Basis and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator
Net income	$ 30,705	$ 32,195	$ 64,464	$ 26,664
Denominator
Denominator for basic earnings per share — weighted average shares outstanding (in shares)	53,098	52,993	53,068	52,941
Dilutive effect of unvested restricted stock units and options issued to employees and directors (in shares)	441	352	456	388
Denominator for diluted earnings per share (in shares)	53,539	53,345	53,524	53,329
Earnings per Common Share:
Basic net earnings per share (in USD per share)	$ 0.58	$ 0.61	$ 1.21	$ 0.50
Diluted net earnings per share (in USD per share)	$ 0.57	$ 0.60	$ 1.20	$ 0.50

X

- Definition

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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