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Income Taxes (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax (benefit) expense | $ (1,764,000) | $ 2,389,000 | $ 5,668,000 | $ 7,505,000 |
Effective income tax rate | 48.50% | 47.70% | 24.40% | (38.20%) |
Increase in effective tax rate due to benefits from tax credit and reversal of provisional estimate for transition tax | 14.80% |  |  |  |
Decrease in effective tax rate due to change in U.S. federal statutory rate | $ 0.14 |  |  |  |
Provisional discrete net tax benefit recorded as result of changes in tax law |  |  |  |  | $ 73,500,000
Provisional tax expense (benefit) for one-time transition tax recorded as result of changes in tax law | (1,400,000) |  |  |  | 1,400,000
Provisional tax expense (benefit) recorded for revaluation of deferred tax assets and liabilities as result of changes in tax law | $ 1,300,000 |  |  |  | $ (74,900,000)

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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