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Earnings Per Share (Computation of basic and diluted earnings per share) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Numerator for basic and diluted earnings per share:
Net income (loss)	$ 18,579	$ 7,706
Denominators:
Average basic shares outstanding	23,431,000	23,115,000
Effect of dilutive employee stock options and other share-based awards	346,000	495,000
Average diluted shares outstanding	23,777,000	23,610,000

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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

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