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Income Taxes (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
U.S. Federal statutory income tax rate | 21.00% | 35.00% | 34.60%
U.S. Federal statutory income tax rate after the Tax Cuts And Jobs Act Of 2017 becomes effective |  | 21.00% |
Income tax benefit from Tax Cuts And Jobs Act of 2017 | $ 0 | $ 5,342 | $ 0
Diluter per share impact of income tax benefit from Tax Cuts And Jobs Act of 2017 |  | $ 2.82 |

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