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Earnings Per Share (Computation of basic and diluted earnings per share) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator for basic and diluted earnings per share:
Net income	$ 16,599	$ 18,579	$ 15,912	$ 7,706	$ 35,178	$ 23,618
Denominators:
Average basic shares outstanding	23,631,000		23,272,000		23,532,000	23,194,000
Effect of dilutive employee stock options and other share-based awards	295,000		449,000		300,000	427,000
Average diluted shares outstanding	23,926,000		23,721,000		23,832,000	23,621,000

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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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