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Fair Value - Rollforward of Level 3 assets and liabilities (Details) - Recurring - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Contingent consideration liability        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ (465) $ (7,967) $ (461) $ (7,998)
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 (18) 0 (72)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (1) 6,735 (5) 6,820
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period (466) (1,250) (466) (1,250)
Available for sale | Structured securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period [2] 3,472 3,846 3,426 5,216
Total gains or (losses) (realized/unrealized) - included in earnings [1],[2] 12 (64) (56) (55)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income [2] (57) (287) 57 (309)
Purchases, issuances, sales and settlements        
Purchases [2] 0 0 0 0
Issuances [2] 0 0 0 0
Sales [2] 0 0 0 0
Settlements [2] (3) (45) (3) (1,402)
Transfers in and/or out of Level 3 [2] 0 0 0 0
Balance at end of period [2] 3,424 3,450 3,424 3,450
Available for sale | Corporate bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 13 1,980 13 8,851
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0 0 7
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 (1,123) 0 (6,539)
Purchases, issuances, sales and settlements        
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 (1,462)
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period 13 857 13 857
Fair value option | Corporate bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 989 965 985 932
Total gains or (losses) (realized/unrealized) - included in earnings [1] 9 0 13 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 0 33 0 66
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period 998 998 998 998
Fair value option | Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 67,930 54,620 67,103 68,817
Total gains or (losses) (realized/unrealized) - included in earnings [1] 633 (987) 881 (1,014)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 5,638 3 13,003 24
Issuances 0 0 0 0
Sales (301) (7,183) (7,087) (24,358)
Settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 2,984
Balance at end of period 73,900 46,453 73,900 46,453
Fair value option | Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 71,176 60,015 68,988 58,094
Total gains or (losses) (realized/unrealized) - included in earnings [1] 2,502 1,432 4,690 3,353
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period 73,678 61,447 73,678 61,447
Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 43,112 55,632 42,015 55,889
Total gains or (losses) (realized/unrealized) - included in earnings [1] 922 11,799 1,826 8,078
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 5,102 0 5,295 3,464
Issuances 0 0 0 0
Sales 0 (15,450) 0 (15,450)
Settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period $ 49,136 $ 51,981 $ 49,136 $ 51,981
[1] Gains or losses were included in net realized gains (losses).
[2] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.