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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Operating Loss Carryforwards [Line Items] |  |  |
Provisional income tax benefit | $ 6,300 |  |
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | $ 5,600 | $ 6,536 | $ 6,256
Unrecognized tax benefits, income tax penalties and interest accrued |  | 300 | $ 300
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards |  | 37,700 |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards |  | 33,700 |
State | Latest tax year |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards |  | 11,800 |
State | Tax year 2023-2027 |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards |  | $ 1,200 |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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