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Variable Interest Entities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
VIEs carrying value	$ 5,650,036	$ 5,631,925
Liabilities	4,536,971	4,519,945
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
VIEs carrying value	252,900	250,400
Variable Interest Entity, Primary Beneficiary | PPM RRG
Variable Interest Entity [Line Items]
VIEs carrying value	135,000	142,000
Surplus notes	5,000
Liabilities	$ 135,000	$ 142,000

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