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Commitments and Contingencies (Narrative and Schedule of Future Minimum Rental Payments for Operating Leases) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]      
Rent expense $ 3,800 $ 4,200 $ 3,300
Aggregate future minimum lease payments due 12,600    
2022 2,509    
2023 2,296    
2024 2,268    
2025 2,154    
2026 1,780    
2027 and thereafter 1,567    
Limited Partnerships      
Other Commitments [Line Items]      
Unfunded commitments 439,600    
Fixed Maturity Securities      
Other Commitments [Line Items]      
Unfunded commitments $ 26,400