Summary Of Significant Accounting Policies (Schedule Of Basic And Diluted Net Income Per Common Share Calculations) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Accounting Policies [Abstract]
Net income	$ 37,079	$ 40,745
Net income available to participating securities	(79)	(67)
Net income available to common shareholders	$ 37,000	$ 40,678
Weighted average common shares outstanding - basic (in shares)	27,461	27,442
Incremental share effect from:
Nonparticipating restricted stock (in shares)	3	3
Stock-settled stock appreciation rights (in shares)	31	72
Weighted average common shares outstanding - diluted (in shares)	27,495	27,517
Net income per common share - basic and diluted (in dollars per share)	$ 1.35	$ 1.48

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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