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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2018
Income Tax Disclosure [Abstract] |
Schedule of Provision for Income Taxes | The provision for income taxes consists of the following:
|  | Years Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (in thousands) |
Current |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | — |  |  | $ | — |
State |  |  | 465 |  |  |  | 359 |  |  |  | 413 |
|  | $ | 465 |  |  | $ | 359 |  |  | $ | 413 |
Deferred |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (17,308 | ) |  |  | 17,713 |  |  |  | 8,982 |
State |  |  | (583 | ) |  |  | 2,802 |  |  |  | 531 |
|  | $ | (17,891 | ) |  | $ | 20,515 |  |  | $ | 9,513 |
(Benefit) provision for income taxes |  | $ | (17,426 | ) |  | $ | 20,874 |  |  | $ | 9,926 |
Schedule of Reconciliation between Effective Tax Rate Income from Continuing Operations and Statutory Rate | Reconciliation between the effective tax rate on income from continuing operations and the statutory tax rate is as follows:
|  | Years Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (in thousands) |
Income tax expense at federal statutory rate |  | $ | 3,878 |  |  | $ | 18,796 |  |  | $ | 8,696 |
(Reduction) increase in income taxes resulting from: |  |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal tax benefit |  |  | 660 |  |  |  | 1,397 |  |  |  | 792 |
Nondeductible stock compensation expenses |  |  | — |  |  |  | — |  |  |  | — |
Permanent items |  |  | 63 |  |  |  | 92 |  |  |  | 71 |
Change in valuation allowances |  |  | (646 | ) |  |  | 531 |  |  |  | 249 |
US Tax Cuts and Jobs Act Impact |  |  | (22,015 | ) |  |  | — |  |  |  | — |
Impact of changing rates on deferred tax assets |  |  | (773 | ) |  |  | (353 | ) |  |  | (673 | )
Expired tax attributes |  |  | 1,088 |  |  |  | 409 |  |  |  | 380 |
Other |  |  | 319 |  |  |  | 2 |  |  |  | 411 |
Income tax (benefit) expense |  | $ | (17,426 | ) |  | $ | 20,874 |  |  | $ | 9,926 |
Schedule of Deferred Tax Assets | The Company's deferred tax assets as of September 30, 2018 and 2017 are as follows:
|  | Years Ended September 30, |
|  | 2018 |  |  | 2017 |
|  | (in thousands) |
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 | )
Schedule of Reconciliation of Total Amounts of Unrecognized Tax Benefits | The following is a tabular reconciliation of the total amounts of unrecognized tax benefits:
|  | Years Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (in thousands) |
Unrecognized tax benefits — October 1 |  | $ | 7,547 |  |  | $ | 7,547 |  |  |  | 7,547 |
Gross increases — tax positions in prior period |  |  | — |  |  |  | — |  |  |  | — |
Gross decreases — tax positions in prior period |  |  | (2,859 | ) |  |  | — |  |  |  | — |
Gross increases — tax positions in current period |  |  | — |  |  |  | — |  |  |  | — |
Settlement |  |  | — |  |  |  | — |  |  |  | — |
Lapse of statute of limitations |  |  | — |  |  |  | — |  |  |  | — |
Unrecognized tax benefits — September 30 |  | $ | 4,688 |  |  | $ | 7,547 |  |  | $ | 7,547 |

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