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Investments - Other investments - Schedule of Other Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Investment Holdings, Other than Securities [Line Items]    
Other investments $ 76,535 $ 168,656
Other    
Investment Holdings, Other than Securities [Line Items]    
Other investments 2,326 80,700
Insurance | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 66,805 79,975
Mortgage | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 7,404 7,981
Corporate bonds, at fair value    
Investment Holdings, Other than Securities [Line Items]    
Other investments 41,494 38,965
Corporate bonds, at fair value | Other    
Investment Holdings, Other than Securities [Line Items]    
Other investments 0 0
Corporate bonds, at fair value | Insurance | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 41,494 38,965
Investment owned, at cost 47,906 36,436
Corporate bonds, at fair value | Mortgage | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 0 0
Vessels    
Investment Holdings, Other than Securities [Line Items]    
Other investments 949 79,368
Vessels | Other    
Investment Holdings, Other than Securities [Line Items]    
Other investments 949 79,368
Vessels | Insurance | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 0 0
Accumulated depreciation, vessels 99 13,059
Vessels | Mortgage | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 0 0
Debentures    
Investment Holdings, Other than Securities [Line Items]    
Other investments 24,961 21,057
Debentures | Other    
Investment Holdings, Other than Securities [Line Items]    
Other investments 0 0
Debentures | Insurance | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 24,961 21,057
Debentures | Mortgage | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 0 0
Trade claims    
Investment Holdings, Other than Securities [Line Items]    
Other investments   19,737
Trade claims | Other    
Investment Holdings, Other than Securities [Line Items]    
Other investments   0
Trade claims | Insurance | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments   19,737
Trade claims | Mortgage | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments   0
Other investments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 9,131 9,529
Other investments | Other    
Investment Holdings, Other than Securities [Line Items]    
Other investments 1,377 1,332
Other investments | Insurance | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 350 216
Other investments | Mortgage | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments $ 7,404 $ 7,981