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Fair Value - Rollforward of Level 3 assets and liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Contingent consideration liability    
Level 3 liabilities rollforward    
Balance at beginning of year $ (7,998) $ (66,665)
Total gains or (losses) (realized/unrealized) - included in earnings [1] (72) (1,478)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances 0 (548)
Sales 0 0
Settlements 7,609 60,693
Transfers in and/or out of Level 3 0 0
Balance at end of year (461) (7,998)
Equity securities    
Level 3 assets rollforward    
Balance at beginning of year 55,889 0
Total gains or (losses) (realized/unrealized) - included in earnings [1] 8,214 (3,418)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 4,030 36,077
Issuances 0 0
Sales (26,118) (27,982)
Settlements 0 0
Transfers in and/or out of Level 3 0 51,212
Balance at end of year 42,015 55,889
Available for sale | Structured securities    
Level 3 assets rollforward    
Balance at beginning of year [2] 5,216 313
Total gains or (losses) (realized/unrealized) - included in earnings [1],[2] 0 1,760
Total gains or (losses) (realized/unrealized) - included in other comprehensive income [2] (169) 3
Purchases, issuances, sales and settlements    
Purchases [2] 0 0
Issuances [2] 0 0
Sales [2] 0 (1,757)
Settlements [2] (1,413) (552)
Transfers in and/or out of Level 3 [2] (208) 5,449
Balance at end of year [2] 3,426 5,216
Available for sale | Corporate bonds    
Level 3 assets rollforward    
Balance at beginning of year 8,851 8,141
Total gains or (losses) (realized/unrealized) - included in earnings [1] (5,865) 2
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 397 (267)
Purchases, issuances, sales and settlements    
Purchases 0 881
Issuances 0 0
Sales 0 0
Settlements (1,462) (1,766)
Transfers in and/or out of Level 3 (1,908) 1,860
Balance at end of year 13 8,851
Fair value option | Corporate bonds    
Level 3 assets rollforward    
Balance at beginning of year 932 5,758
Total gains or (losses) (realized/unrealized) - included in earnings [1] (13) (162)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 66 0
Issuances 0 0
Sales 0 (28,583)
Settlements 0 0
Transfers in and/or out of Level 3 0 23,919
Balance at end of year 985 932
Fair value option | Other investments    
Level 3 assets rollforward    
Balance at beginning of year 68,817 62,705
Total gains or (losses) (realized/unrealized) - included in earnings [1] (314) (8,119)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 52,449 3,746
Issuances 0 0
Sales (56,833) (20,495)
Settlements 0 (600)
Transfers in and/or out of Level 3 2,984 31,580
Balance at end of year 67,103 68,817
Fair value option | Equity securities    
Level 3 assets rollforward    
Balance at beginning of year 58,094 0
Total gains or (losses) (realized/unrealized) - included in earnings [1] 10,894 1,949
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 0 0
Settlements 0 0
Transfers in and/or out of Level 3 0 56,145
Balance at end of year $ 68,988 $ 58,094
[1] Gains or losses were included in net realized gains (losses).
[2] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities