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Additional Balance Sheet and Cash Flow Information - Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Debt securities | $ 0 | $ 10,007
Mutual funds | 52,575 | 44,243
Total Marketable Securities | $ 52,575 | $ 54,250

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