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						9 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2023	Mar. 31, 2022
Accounting Policies [Abstract]
Net income (loss)	$ 24,555	$ 39,973	$ 37,592	$ (4,483)	$ 34,370	$ 30,655	$ 102,120	$ 60,542
Net income available to participating securities	(43)			(52)			(246)	(168)
Net income (loss) available to common shareholders	$ 24,512			$ (4,535)			$ 101,874	$ 60,374
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average common shares outstanding - basic (in shares)	27,465			27,442			27,462	27,448
Weighted average common shares outstanding - diluted (in shares)	27,487			27,442			27,479	27,478
Net income (loss) per common share - basic	$ 0.89			$ (0.17)			$ 3.71	$ 2.20
Net income (loss) per common share – diluted	$ 0.89			$ (0.17)			$ 3.71	$ 2.20
Nonparticipating Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental share effect from awards with forfeitable dividends (in shares)	1			0			2	3
Stock Settled Stock Appreciation Rights SARS [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental share effect from stock-settled stock appreciation rights (in shares)	19			0			12	26
Weighted average number of antidilutive securities (in rights outstanding)				300			100	200
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental share effect from awards with forfeitable dividends (in shares)	2			0			3	1