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Income Taxes - Components of the Temporary Differences (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011
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Deferred Tax Assets: [Abstract] |  |  |
Postretirement benefits | $ 26,014 | $ 27,568 | $ 18,260
Accrued liabilities | 4,477 | 3,958 | 4,138
Capital loss carryforward | 1,105 | 2,865 | 2,945
Net operating loss carryforward | 44,607 | 44,736 | 36,328
Intangible assets | 694 | 919 | 0
Other | 7,840 | 3,080 | 5,458
Total deferred tax assets | 84,737 | 83,126 | 67,129
Deferred tax liabilities: [Abstract] |  |  |
Fixed assets | (2,641) | (4,117) | (7,881)
Intangible Assets | 0 | 0 | (1,032)
Other | (882) | (794) | (814)
Total deferred tax liabilities | (3,523) | (4,911) | (9,727)
Valuation allowance | (82,522) | (79,448) | (58,712)
Net deferred tax liability | $ 1,308 | $ 1,233 | $ 1,310

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