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Investments - Schedule of Investments in Two Sigma Funds (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Marketable Securities [Line Items]
Cost	$ 891,791	$ 731,100
Investments in Two Sigma Funds, at fair value	979,986	740,736
Two Sigma Funds
Marketable Securities [Line Items]
Net Unrealized Gains (Losses)	88,195	9,636
Investments in Two Sigma Funds, at fair value	979,986	740,736
Two Sigma Futures Portfolio, LLC (FTV)
Marketable Securities [Line Items]
Cost	469,379	438,625
Net Unrealized Gains (Losses)	(7,212)	(95,213)
Investments in Two Sigma Funds, at fair value	462,167	343,412
Two Sigma Spectrum Portfolio, LLC (STV)
Marketable Securities [Line Items]
Cost	239,819	171,135
Net Unrealized Gains (Losses)	54,115	57,982
Investments in Two Sigma Funds, at fair value	293,934	229,117
Two Sigma Equity Spectrum Portfolio, LLC (ESTV)
Marketable Securities [Line Items]
Cost	182,593	121,340
Net Unrealized Gains (Losses)	41,292	46,867
Investments in Two Sigma Funds, at fair value	$ 223,885	$ 168,207

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