Income Taxes (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Dec. 31, 2016 |
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| Income Tax Disclosure [Abstract] | ||||||
| Income tax provision (benefit) | $ (4,153) | $ 50,063 | $ (10,993) | $ 46,167 | ||
| Release of deferred tax asset valuation allowance | $ 53,900 | |||||
| Foreign income taxes | 4,800 | |||||
| Withholding taxes | 2,700 | |||||
| Business acquisition, uncertain tax positions | 11,900 | 11,900 | 11,000 | |||
| Unrecognized tax benefits, income tax penalties and interest accrued | $ 7,900 | $ 7,900 | $ 6,100 | |||
| Minimum | Forecast | ||||||
| Income Tax Contingency [Line Items] | ||||||
| Impact of new tax legislation | $ 5,000 | |||||
| Maximum | Forecast | ||||||
| Income Tax Contingency [Line Items] | ||||||
| Impact of new tax legislation | $ 8,000 | |||||
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- Definition Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Liability For Uncertain Tax Positions No definition available.
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- Definition Effective Income Tax Rate Reconciliation, Withholding Taxes No definition available.
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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- References No definition available.
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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