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Income Taxes Impact of New Tax Legislation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
AMT Receivable Resulting from TCJA | $ 37,019 |
Change in Impact of AMT Repeal on Current Taxes | $ 1,902 |
AMT Installment Payment End Date | Dec. 31, 2021 |
Impact of AMT Repeal on Current Taxes |  | $ 29,581
AMT Related to Filing of 2017 Tax Return |  | $ 5,536

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- Definition AMT Related to Filing of 2017 Tax Return + References No definition available. + Details
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