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Income Taxes (Details 1) - USD ($) $ in Thousands | Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2012
--- | --- | --- | --- | ---
Deferred income tax assets: |  |  |  |
Bad debt reserve | $ 550 | $ 2,188 |  |
Accrued expenses | 4,629 | 2,937 |  |
Stock options and restricted stock | 1,030 | 2,131 |  |
Charitable contributions | 1,277 | 1,230 |  |
Impairment | 25,746 | 25,745 |  |
Depreciation | 7,232 | 7,566 |  |
Unrealized gain | 138 | 163 |  |
Net operating loss | 125,223 | 126,093 |  |
Credits | 2,892 | 3,123 |  |
Total deferred income tax assets | 168,717 | 171,176 |  |
Valuation allowance | (155,393) | (151,975) | $ (167,328) | $ (204,977)
DEFERRED INCOME TAX ASSETS, NET | $ 13,324 | $ 19,201 |  |

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