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Investments - Equity securities - Debt Securities, Trading, and Equity Securities (Details) - USD ($)
$ in Thousands, shares in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]    
Cost $ 227,851 $ 236,670
Fair Value 120,895 138,483
Other    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 111,491 111,491
Fair Value 19,949 28,799
Insurance | Operating segments    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 116,360 125,179
Fair Value 100,946 109,684
Fixed income ETFs    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 52,176 52,176
Fair Value 51,718 53,154
Fixed income ETFs | Other    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 0 0
Fair Value 0 0
Fixed income ETFs | Insurance | Operating segments    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 52,176 52,176
Fair Value 51,718 53,154
Other equity securities    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 40,845 49,664
Fair Value 45,061 50,515
Other equity securities | Other    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 0 0
Fair Value 0 0
Other equity securities | Insurance | Operating segments    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 40,845 49,664
Fair Value $ 45,061 $ 50,515
Invesque    
Debt and Equity Securities, FV-NI [Line Items]    
Equity securities, shares held 17.0 17.0
Cost $ 134,830 $ 134,830
Fair Value 24,116 34,814
Invesque | Other    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 111,491 111,491
Fair Value 19,949 28,799
Invesque | Insurance | Operating segments    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 23,339 23,339
Fair Value $ 4,167 $ 6,015