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Basis of Presentation - Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Feb. 28, 2017
Computation of basic and diluted earnings per share
Net income available to common stockholders	$ 20,986	$ 19,107	$ 41,729	$ 28,509
Weighted average shares outstanding-basic	18,312	18,085	18,285	18,088
Dilutive effect of equity awards	370	539	498	591
Dilutive effect of the Notes				0
Weighted average shares outstanding-diluted	18,682	18,624	18,783	18,679
Basic earnings per share	$ 1.15	$ 1.06	$ 2.28	$ 1.58
Diluted earnings per share	$ 1.12	$ 1.03	$ 2.22	$ 1.53
Weighted average shares excluded from diluted earnings (loss) per share due to their anti-dilutive effect (in thousands)	94	126	85	81
1.25% Convertible Senior Notes Due 2022
Per Share Computations
Interest rate (as a percentage)	1.25%		1.25%		1.25%

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