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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		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Numerator
Net income	$ 38,058	$ 38,167	$ 105,235	$ 103,474
Denominator
Denominator for basic earnings per share — weighted average shares outstanding (in shares)	50,378	51,881	50,840	52,119
Dilutive effect of nonvested restricted stock units and options issued to employees and directors (in shares)	453	321	386	312
Denominator for diluted earnings per share (in shares)	50,831	52,202	51,226	52,431
Earnings per Common Share:
Basic earnings per share (in USD per share)	$ 0.76	$ 0.74	$ 2.07	$ 1.99
Diluted earnings per share (in USD per share)	$ 0.75	$ 0.73	$ 2.05	$ 1.97

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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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