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Income Taxes (Details 1) - USD ($) $ in Thousands | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
--- | --- | --- | ---
Deferred income tax assets: |  |  |
Bad debt reserve | $ 535 | $ 575 |
Accrued expenses | 7,888 | 5,327 |
Stock options and restricted stock | 1,608 | 1,802 |
Charitable contributions | 1,768 | 1,527 |
Impairment | 27,944 | 25,746 |
Depreciation | 4,438 | 6,785 |
Unrealized gain | 317 | 193 |
Net operating loss | 122,260 | 122,849 |
Credits | 2,899 | 3,192 |
Total deferred income tax assets | 169,657 | 167,996 |
Valuation allowance | (157,816) | (158,442) | $ (155,393)
Deferred tax assets, net of valuation allowance | 11,841 | 9,554 |
Deferred income tax liabilities: |  |  |
Unrealized loss |  | 42 |
NET DEFERRED INCOME TAX ASSETS | $ 11,841 | $ 9,512 |

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