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Variable Interest Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
VIEs carrying value	$ 5,573,957	$ 5,699,999
Liabilities	4,562,114	4,595,981
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
VIEs carrying value	268,800	277,500
Variable Interest Entity, Primary Beneficiary | PPM RRG
Variable Interest Entity [Line Items]
VIEs carrying value	136,000	154,000
Surplus notes	5,000
Liabilities	$ 136,000	$ 154,000

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