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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, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Feb. 28, 2017
Computation of basic and diluted earnings per share
Net income (loss) available to common stockholders	$ 2,553	$ 14,019	$ (34,241)	$ 19,529
Weighted average shares outstanding-basic	18,569	18,913	18,773	18,964
Dilutive effect of equity awards	577	602		621
Weighted average shares outstanding-diluted	19,146	19,515	18,773	19,585
Basic earnings (loss) per share	$ 0.14	$ 0.74	$ (1.82)	$ 1.03
Diluted earnings (loss) per share	$ 0.13	$ 0.72	$ (1.82)	$ 1.00
Shares excluded from computation of diluted net income per share
Stock options excluded from computation due to antidilutive effect (in shares)	300
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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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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