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Income Taxes - Temporary differences (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
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Income Tax Disclosure [Abstract] |  |
Property and equipment | $ 22,650 | $ 18,535
Depletion | 479 | 453
Unrealized rents | 1,803 | 1,608
Prepaid expenses | 1,306 | 1,913
Gross deferred tax liabilities | 26,238 | 22,509
Insurance liabilities | 786 | 1,744
Employee benefits and other | 2,758 | 2,508
Gross deferred tax assets | 3,544 | 4,252
Net deferred tax liability | $ 22,694 | $ 18,257

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