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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, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Feb. 28, 2017
Computation of basic and diluted earnings per share
Net income (loss) available to common stockholders	$ 19,626	$ 2,553	$ 48,135	$ (34,241)
Weighted average shares outstanding-basic	18,079	18,569	18,085	18,773
Dilutive effect of equity awards	592	577	593
Weighted average shares outstanding-diluted	18,671	19,146	18,678	18,773
Basic earnings (loss) per share	$ 1.09	$ 0.14	$ 2.66	$ (1.82)
Diluted earnings (loss) per share	$ 1.05	$ 0.13	$ 2.58	$ (1.82)
Weighted average shares excluded from diluted earnings (loss) per share due to their anti-dilutive effect (in thousands)	44	288	46	753
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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