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Income Taxes - Schedule of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]    
Net operating carry forwards $ 106,645 $ 91,981
Deferred credits 1,882 2,443
Other accrued expenses 2,329 1,871
Prepaids and other 2,576 3,530
State alternative minimum tax 1 1
Other reserves and estimated losses 947 836
Operating lease 4,928 6,399
Allowance for doubtful receivables   905
Subtotal 119,308 107,966
Less: valuation allowance (1,890) (1,940)
Total net deferred tax assets 117,418 106,026
Intangibles (2,204) (2,613)
Property and equipment (170,517) (143,210)
Total deferred tax liabilities (172,721) (145,823)
Net deferred tax liability $ (55,303) $ (39,797)