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, 2017	Sep. 30, 2016
Accounting Policies [Abstract]
Net income	$ 29,386	$ 33,400
Net income available to participating securities	(47)	(66)
Net income available to common shareholders	$ 29,339	$ 33,334
Weighted average common shares outstanding - basic (in shares)	27,396	27,363
Incremental share effect from:
Nonparticipating restricted stock (in shares)	4	5
Stock-settled stock appreciation rights (in shares)	51	62
Weighted average common shares outstanding - diluted (in shares)	27,451	27,430
Net income per common share - basic and diluted (in dollars per share)	$ 1.07	$ 1.22