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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator
Net income	$ 33,252	$ 30,841	$ 67,177	$ 65,307
Denominator
Denominator for basic earnings per share — weighted average shares outstanding (in shares)	50,455	51,841	51,073	52,238
Dilutive effect of nonvested restricted stock units and options issued to employees and directors (in shares)	356	312	353	307
Denominator for diluted earnings per share (in shares)	50,811	52,153	51,426	52,545
Earnings per Common Share:
Basic earnings per share (in USD per share)	$ 0.66	$ 0.59	$ 1.32	$ 1.25
Diluted earnings per share (in USD per share)	$ 0.65	$ 0.59	$ 1.31	$ 1.24

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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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