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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Effective income tax rate | (1959.30%) | 55.70% |
Tax Cuts And Jobs Act Of 2017, provisional income tax benefit |  |  | $ 64,343
Tax Cuts And Jobs Act Of 2017, repatriation of non-US earnings |  |  | 43,000
Tax Cuts And Jobs Act Of 2017, benefit from undistributed foreign earnings |  |  | $ 25,196

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