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Earnings Per Share (Details) (USD $) In Thousands, except Share data	3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share
Income per common share, basic, Net Income	$ 18,380	$ 15,708
Income per common share, basic, Shares	27,138,000	26,713,000
Income per common share, basic, Per Share Amount	$ 0.68	$ 0.59
Effect of dilutive stock options, Shares	413,000	279,000
Income per common share, diluted, Net Income	$ 18,380	$ 15,708
Net income per common share, diluted, Shares	27,551,000	26,992,000
Income per common share, diluted, Per Share Amount	$ 0.67	$ 0.58
Weighted average shares excluded from the computation of diluted earnings per share	692,856	1,318,435

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