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Income Taxes - Components of the Temporary Differences (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | ---
Deferred Tax Assets: [Abstract] |  |  |
Postretirement benefits | $ 18,862 | $ 29,813 | $ 33,815
Accrued liabilities | 4,754 | 7,885 | 11,760
Net operating loss carryforward | 32,552 | 38,981 | 38,196
Other | 6,728 | 6,824 | 6,952
Total deferred tax assets | 62,896 | 83,503 | 90,723
Deferred tax liabilities: [Abstract] |  |  |
Unrealized gain on investments | 0 | 0 | (609)
Fixed assets | (16,156) | (17,096) | (5,370)
Other | (5,536) | (10,861) | (11,609)
Total deferred tax liabilities | (21,692) | (27,957) | (17,588)
Valuation allowance | (1,896) | (1,613) | (1,627)
Net deferred tax assets (liabilities) | $ 39,308 | $ 53,933 | $ 71,508

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