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Income Taxes - Components of the Temporary Differences (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
--- | --- | --- | ---
Deferred Tax Assets: [Abstract] |  |  |
Postretirement benefits | $ 33,273 | $ 31,100 | $ 19,800
Accrued liabilities | 11,760 | 10,091 | 6,156
Net operating loss carryforward | 38,196 | 41,544 | 40,275
Intangible assets | 71 | 594 | 1,126
Other | 6,881 | 6,794 | 7,253
Total deferred tax assets | 90,181 | 90,123 | 74,610
Deferred tax liabilities: [Abstract] |  |  |
Unrealized gain on investments | (609) | (2,242) | 0
Fixed assets | (5,370) | (2,647) | (1,902)
Other | (1,789) | (1,943) | (1,538)
Total deferred tax liabilities | (7,768) | (6,832) | (3,440)
Valuation allowance | (1,627) | (84,857) | (72,613)
Net deferred tax assets (liabilities) | $ 80,786 |  |
Net deferred tax assets (liabilities) |  | $ (1,566) | $ (1,443)

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