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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
VIEs carrying value	$ 5,891,190	$ 6,191,477
Liabilities	4,721,301	4,763,090
Variable Interest Entity, Primary Beneficiary | PPM RRG
Variable Interest Entity [Line Items]
VIEs carrying value	147,000
Surplus Notes	5,000
Liabilities	147,000
Equity investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
VIEs carrying value	$ 291,900	$ 303,700

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