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Supplemental Balance Sheet and Income Statement Information - Investment income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Investment income (loss) |  |
Interest and dividend income | $ 2,033 | $ 1,191
Gains (losses) on marketable securities | 7,644 | (726)
Investment income (loss) | $ 9,677 | $ 465

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