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Fair Value - Rollforward of Level 3 assets and liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Contingent consideration liability    
Level 3 liabilities rollforward    
Balance at beginning of year $ (461) $ (7,998)
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 (72)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases (16,494) 0
Issuances 0 0
Sales 0 [2] 0
Settlements (5) 7,609
Transfers in and/or out of Level 3 0 0
Balance at end of year (16,960) (461)
Equity securities    
Level 3 assets rollforward    
Balance at beginning of year 42,015 55,889
Total gains or (losses) (realized/unrealized) - included in earnings [1] 1,958 8,214
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 5,718 4,030
Issuances 0 0
Sales (46,773) [2] (26,118)
Settlements 0 0
Transfers in and/or out of Level 3 0 0
Balance at end of year 2,918 42,015
Available for sale | Structured securities    
Level 3 assets rollforward    
Balance at beginning of year [3] 3,426 5,216
Total gains or (losses) (realized/unrealized) - included in earnings [1],[3] (135) 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income [3] 133 (169)
Purchases, issuances, sales and settlements    
Purchases [3] 0 0
Issuances [3] 0 0
Sales [3] 0 [2] 0
Settlements [3] (77) (1,413)
Transfers in and/or out of Level 3 [3] 0 (208)
Balance at end of year [3] 3,347 3,426
Available for sale | Corporate bonds    
Level 3 assets rollforward    
Balance at beginning of year 13 8,851
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 (5,865)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 397
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances 0 0
Sales 0 [2] 0
Settlements 0 (1,462)
Transfers in and/or out of Level 3 0 (1,908)
Balance at end of year 13 13
Fair value option | Corporate bonds    
Level 3 assets rollforward    
Balance at beginning of year 985 932
Total gains or (losses) (realized/unrealized) - included in earnings [1] 13 (13)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 0 66
Issuances 0 0
Sales (998) [2] 0
Settlements 0 0
Transfers in and/or out of Level 3 0 0
Balance at end of year 0 985
Fair value option | Other investments    
Level 3 assets rollforward    
Balance at beginning of year 67,103 68,817
Total gains or (losses) (realized/unrealized) - included in earnings [1] 868 (314)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 13,213 52,449
Issuances 0 0
Sales (53,203) [2] (56,833)
Settlements 0 0
Transfers in and/or out of Level 3 0 2,984
Balance at end of year 27,981 67,103
Fair value option | Equity securities    
Level 3 assets rollforward    
Balance at beginning of year 68,988 58,094
Total gains or (losses) (realized/unrealized) - included in earnings [1] 4,941 10,894
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances 0 0
Sales (69,181) [2] 0
Settlements 0 0
Transfers in and/or out of Level 3 0 0
Balance at end of year $ 4,748 $ 68,988
[1] Gains or losses were included in net realized gains (losses).
[2] Sales for the 2021 period primarily relates to the Company’s deconsolidation of Somers
[3] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities