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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, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 28, 2017
Computation of basic and diluted earnings per share |  |  |  |  |
Net income (loss) available to common stockholders | $ (46,951) | $ 4,833 | $ (36,794) | $ 5,510 |
Weighted average shares outstanding-basic | 18,971 | 19,036 | 18,874 | 18,989 |
Dilutive effect of equity awards |  | 617 |  | 631 |
Weighted average shares outstanding-diluted | 18,971 | 19,653 | 18,874 | 19,620 |
Basic earnings (loss) per share | $ (2.47) | $ 0.25 | $ (1.95) | $ 0.29 |
Diluted earnings (loss) per share | $ (2.47) | $ 0.25 | $ (1.95) | $ 0.28 |
Shares excluded from computation of diluted net income per share |  |  |  |  |
Stock options excluded from computation due to antidilutive effect (in shares) | 100 |  |  | 100 |
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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