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Earnings Per Share (Computation of basic and diluted earnings per share) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator for basic and diluted earnings per share:
Net income (loss)	$ (4,104)	$ (2,969)	$ 16,599	$ 18,579	$ (7,073)	$ 35,178
Denominators:
Average basic shares outstanding	23,883		23,631		23,843	23,532
Effect of dilutive employee stock options and other share-based awards	0		295		0	300
Average diluted shares outstanding	23,883		23,926		23,843	23,832

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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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