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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