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Investments - Net Investment Income - Insurance - Components of Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Schedule of Investments [Line Items]        
Net investment income $ 3,632 $ 3,330 $ 10,164 $ 9,331
Other revenue 17,364 21,058 63,007 52,237
Vessel related revenue 79,743 68,814 223,985 182,296
Vessel related revenue        
Schedule of Investments [Line Items]        
Vessel related revenue 7,829 11,426 28,337 25,043
Insurance        
Schedule of Investments [Line Items]        
Subtotal 4,861 3,894 13,592 10,999
Less: investment expenses 1,229 564 3,428 1,668
Net investment income 3,632 3,330 10,164 9,331
Insurance | AFS securities        
Schedule of Investments [Line Items]        
Investment income, gross 3,094 1,840 7,955 5,246
Insurance | Loans, at fair value        
Schedule of Investments [Line Items]        
Investment income, gross 173 181 514 680
Insurance | Other investments        
Schedule of Investments [Line Items]        
Investment income, gross 1,382 1,597 4,240 4,593
Insurance | Dividends from equity securities        
Schedule of Investments [Line Items]        
Investment income, gross 212 276 883 480
Mortgage        
Schedule of Investments [Line Items]        
Other revenue 12,593 17,890 47,483 45,060
Mortgage | Loans, at fair value        
Schedule of Investments [Line Items]        
Other revenue 766 1,450 4,652 4,506
Mortgage | Loans, at fair value | Loan fee income        
Schedule of Investments [Line Items]        
Other revenue $ 3,998 $ 5,014 $ 14,494 $ 15,511