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Income Taxes - Tax Credit Carryforwards (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Valuation allowance |
Increase (decrease) in valuation allowance | $ 14.5
2017 Tax Act, Increase in deferred tax assets valuation allowance | 6.8
Federal | Capital loss carryforward |
Tax credit carryforward |
Tax credit carry forwards | 3.5
Federal | Research and development tax credit carryforward |
Tax credit carryforward |
Tax credit carry forwards | 28.3
Federal | Research and development tax credit carryforward | Ultratech |
Tax credit carryforward |
Tax credit carry forwards | 11.4
State and local |
Tax credit carryforward |
Tax credit carry forwards | 27.4
Foreign tax |
Tax credit carryforward |
Tax credit carry forwards | $ 9.4

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