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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, 2018	Sep. 30, 2017	Feb. 28, 2017
Computation of basic and diluted earnings per share
Net income (loss) available to common stockholders	$ 9,402	$ 10,157
Weighted average shares outstanding-basic	18,090	18,778
Dilutive effect of equity awards	646	813
Weighted average shares outstanding-diluted	18,736	19,591
Basic earnings (loss) per share	$ 0.52	$ 0.54
Diluted earnings (loss) per share	$ 0.50	$ 0.52
Shares excluded from computation of diluted net income per share
Stock option and stock awards excluded from computation due to antidilutive effect (in shares)		100
1.25% Convertible Senior Notes Due 2022
Per Share Computations
Interest rate (as a percentage)	1.25%		1.25%

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