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Income Taxes - Schedule of Unrecognized Tax Benefits (Footnote) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits | $ 20,638 | $ 10,589 | $ 9,622 | $ 2,281
Income Tax Receivables |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits | 7,800 |  |  |
Other Liabilities |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits | $ 12,800 |  |  |

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