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Income Taxes (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective tax rate | (4.00%) |  | 20.00% | (4.00%) | 29.00%
Tax benefit for refunds of foreign withholding tax, partially offset by state and foreign tax expense | $ 2,300,000 |  |  | $ 2,300,000 |
Reduction in net deferred tax assets due to Tax Cuts And Jobs Act Of 2017 |  | $ 105,700,000 |  |  |
Transaction tax on mandatory deemed repatriation of foreign earnings |  | 0 |  |  |
Net deficit in foreign earnings |  | $ 41,200,000 |  |  |

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