Variable Interest Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Assets	$ 5,574,273	$ 5,631,925
Liabilities	4,372,524	4,519,945
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	234,400	250,400
Variable Interest Entity, Primary Beneficiary | PPM RRG
Variable Interest Entity [Line Items]
Assets	139,000	142,000
Surplus notes	5,000
Liabilities	$ 139,000	$ 142,000