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Investments - Other investments - Schedule of Other Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Investment Holdings, Other than Securities [Line Items]    
Other investments $ 132,305 $ 168,656
Other    
Investment Holdings, Other than Securities [Line Items]    
Other investments 66,626 80,700
Insurance | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 56,523 79,975
Mortgage | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 9,156 7,981
Corporate bonds, at fair value    
Investment Holdings, Other than Securities [Line Items]    
Other investments 34,700 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 34,700 38,965
Investment owned, at cost 33,729 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 65,307 79,368
Vessels | Other    
Investment Holdings, Other than Securities [Line Items]    
Other investments 65,307 79,368
Vessels | Insurance | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 0 0
Accumulated depreciation, vessels 11,556 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 21,783 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 21,783 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 10,515 9,529
Other investments | Other    
Investment Holdings, Other than Securities [Line Items]    
Other investments 1,319 1,332
Other investments | Insurance | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments 40 216
Other investments | Mortgage | Operating segments    
Investment Holdings, Other than Securities [Line Items]    
Other investments $ 9,156 $ 7,981