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Fair Value and Equity Investments, Equity Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Upward fair value adjustments on equity securities |  | $ 18,077 | $ 0 |
Equity Securities [Member] |  |  |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Carrying amount of equity securities without readily determinable fair values | $ 28,100 | 28,100 |  | $ 5,000
Additional investment made | 5,000 |  |  |
Equity Securities [Member] | Other Income (Expense), Net [Member] |  |  |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Upward fair value adjustments on equity securities | $ 18,100 | $ 18,100 |  |

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