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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | $ 577,090 | $ 702,617
Financials |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | 227,257 | 452,765
Communications and technology |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | 93,458 | 119,592
Consumer |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | 58,699 | 44,477
Industrial, utilities and energy |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | 32,891 | 43,380
Healthcare |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | 32,041 | 35,140
Basic materials |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | 6,051 | 7,263
Exchange traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | $ 126,693 | $ 0

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