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Income Taxes - Schedule of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]    
Net operating loss carry forwards $ 91,981 $ 103,653
Deferred credits 2,443 4,389
Other accrued expenses 1,871 1,756
Prepaids and other 3,530 8,936
Alternative minimum tax 1 2,536
Other reserves and estimated losses 836 1,335
Operating lease 6,399 13,113
Allowance for doubtful receivables 905 1,087
Subtotal 107,966 136,805
Less: valuation allowance (1,940) (2,586)
Total net deferred tax assets 106,026 134,219
Intangibles (2,613) (4,317)
Property and equipment (143,210) (186,338)
Total deferred tax liabilities (145,823) (190,655)
Net deferred tax liability $ (39,797) $ (56,436)