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Basis of Presentation - Earnings Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Computation of basic and diluted earnings per share
Net income available to common stockholders	$ 19,797	$ 20,038	$ 38,849	$ 29,382
Weighted average shares outstanding-basic	17,838	17,924	17,892	17,988
Dilutive effect of equity awards	268	272	311	278
Dilutive effect of the Notes	0	0	0	0
Weighted average shares outstanding-diluted	18,106	18,196	18,203	18,266
Basic earnings per share	$ 1.11	$ 1.12	$ 2.17	$ 1.63
Diluted earnings per share	$ 1.09	$ 1.10	$ 2.13	$ 1.61
Shares excluded from diluted earnings per share due to their anti-dilutive effect	62	45	25	89
1.25% Convertible Senior Notes Due 2022
Per Share Computations
Interest rate (as a percentage)	1.25%		1.25%
Computation of basic and diluted earnings per share
Conversion price	$ 107.46		$ 107.46

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