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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
	Jun. 30, 2019	Jun. 30, 2018
Numerator
Net income	$ 33,925	$ 34,466
Denominator
Denominator for basic earnings per share — weighted average shares outstanding (in shares)	51,697	52,640
Dilutive effect of nonvested restricted stock units and options issued to employees and directors (in shares)	350	302
Denominator for diluted earnings per share (in shares)	52,047	52,942
Earnings per Common Share:
Basic earnings per share (in USD per share)	$ 0.66	$ 0.65
Diluted earnings per share (in USD per share)	$ 0.65	$ 0.65

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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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