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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, 2016
Sep. 30, 2015
Accounting Policies [Abstract]    
Net income $ 33,400 $ 27,628
Net income available to participating securities (66) (35)
Net income available to common shareholders $ 33,334 $ 27,593
Weighted average common shares outstanding - basic (in shares) 27,363 27,319
Incremental share effect from:    
Nonparticipating restricted stock (in shares) 5 5
Stock-settled stock appreciation rights (in shares) 62 20
Weighted average common shares outstanding - diluted (in shares) 27,430 27,344
Net income per common share - basic and diluted (in dollars per share) $ 1.22 $ 1.01