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Income Taxes - Components of the Temporary Differences (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
--- | --- | --- | ---
Deferred Tax Assets: [Abstract] |  |  |
Postretirement benefits | $ 30,253 | $ 33,273 | $ 31,100
Accrued liabilities | 7,885 | 11,760 | 10,091
Net operating loss carryforward | 38,985 | 38,196 | 41,544
Intangible assets | 0 | 71 | 594
Other | 6,824 | 6,881 | 6,794
Total deferred tax assets | 83,947 | 90,181 | 90,123
Deferred tax liabilities: [Abstract] |  |  |
Unrealized gain on investments | 0 | (609) | (2,242)
Fixed assets | (17,096) | (5,370) | (2,647)
Other | (2,181) | (1,789) | (1,943)
Total deferred tax liabilities | (19,277) | (7,768) | (6,832)
Valuation allowance | (1,615) | (1,627) | (84,857)
Net deferred tax assets (liabilities) | $ 63,055 | $ 80,786 |
Net deferred tax assets (liabilities) |  |  | $ (1,566)

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