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Additional Balance Sheet and Cash Flow Information - Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jul. 01, 2018
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Debt securities | $ 0 | $ 10,007 | $ 0
Mutual funds | 51,543 | 44,243 | 49,537
Total marketable securities | $ 51,543 | $ 54,250 | $ 49,537

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