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Variable Interest Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	$ 2,891,400	$ 2,713,903
Liabilities	2,116,446	2,028,235
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	2,900	1,400
Liabilities	22	0
Hedge Funds [Member]
Variable Interest Entity [Line Items]
Total VIE Assets	545,896	643,251
Carrying Value of Variable Interest Assets	0	0
Carrying Value of Variable Interest Liabilities	0	0
Capital Commitments	0	0
Maximum Exposure to Loss in Non- consolidated VIEs	$ 0	$ 0

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