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Basis of Presentation - Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Feb. 28, 2017
Computation of basic and diluted earnings per share
Net income available to common stockholders	$ 20,743	$ 9,402
Weighted average shares outstanding-basic	18,259	18,090
Dilutive effect of equity awards	628	646
Dilutive effect of the Notes	16	0
Weighted average shares outstanding-diluted	18,903	18,736
Basic earnings per share	$ 1.14	$ 0.52
Diluted earnings per share	$ 1.10	$ 0.50
Weighted average shares excluded from diluted earnings (loss) per share due to their anti-dilutive effect (in thousands)	84	42
1.25% Convertible Senior Notes Due 2022
Per Share Computations
Interest rate (as a percentage)	1.25%		1.25%

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