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Consolidated Entities - ISP Fund LP (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
CONSOLIDATED ENTITIES |  |  |  |
Total assets | $ 1,088,290 |  | $ 999,570 | [1]
Unrealized gain on equity investments | $ 54,673 | $ 21,915 |  |
ISP Fund LP |  |  |  |
CONSOLIDATED ENTITIES |  |  |  |
Contributed to partnership for investing |  |  | $ 300,000 |
Economic interest of the Partnership (in percent) | 100.00% |  |  |
Total assets | $ 304,700 |  |  |
Net investment-related expense | 400 |  |  |
Unrealized gain on equity investments | $ 5,800 |  |  |
[1] | Consolidated balance sheet as of December 31, 2020 has been derived from audited consolidated financial statements.

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