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Basis of Presentation - Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Computation of basic and diluted earnings per share
Net income available to common stockholders	$ 19,558	$ 19,626	$ 61,287	$ 48,135
Weighted average shares outstanding-basic	18,182	18,079	18,251	18,085
Dilutive effect of equity awards	331	592	442	593
Dilutive effect of the Notes	0	0	0	0
Weighted average shares outstanding-diluted	18,513	18,671	18,693	18,678
Basic earnings per share	$ 1.08	$ 1.09	$ 3.36	$ 2.66
Diluted earnings per share	$ 1.06	$ 1.05	$ 3.28	$ 2.58
Shares excluded from diluted earnings per share due to their anti-dilutive effect	145	44	100	46
1.25% Convertible Senior Notes Due 2022
Per Share Computations
Interest rate (as a percentage)	1.25%		1.25%

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