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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Apr. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Income Taxes Tax Cuts And Jobs Act [Abstract] |  |  |  |
Increase (decrease) to provisional tax expense, net | $ (17,336) | $ 47,800 |  |
Tax cuts and jobs act, Date enacted |  |  | Dec. 22, 2017 |
Non-US local country withholding taxes, Tax Cuts and Jobs Act of 2017 |  |  |  | $ 1,657
US state and local taxes, Tax Cuts and Jobs Act of 2017 | $ 2,412 |  |  |

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