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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator
Net income	$ 30,841	$ 30,705	$ 65,307	$ 64,464
Denominator
Denominator for basic earnings per share — weighted average shares outstanding (in shares)	51,841	53,098	52,238	53,068
Dilutive effect of nonvested restricted stock units and options issued to employees and directors (in shares)	312	441	307	456
Denominator for diluted earnings per share (in shares)	52,153	53,539	52,545	53,524
Earnings per Common Share:
Basic earnings per share (in USD per share)	$ 0.59	$ 0.58	$ 1.25	$ 1.21
Diluted earnings per share (in USD per share)	$ 0.59	$ 0.57	$ 1.24	$ 1.20

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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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