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Fair Value - Rollforward of Level 3 assets and liabilities (Details) - Recurring - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Contingent consideration liability        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ (466) $ (1,250) $ (461) $ (7,998)
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0 0 (72)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases (17,345) 0 (17,345) 0
Issuances 0 0 0 0
Sales 0 [2] 0 0 [2] 0
Settlements 0 620 (5) 7,440
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period (17,811) (630) (17,811) (630)
Available for sale | Structured securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period [3] 3,424 3,450 3,426 5,216
Total gains or (losses) (realized/unrealized) - included in earnings [1],[3] 10 (75) (46) (130)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income [3] 10 191 67 (118)
Purchases, issuances, sales and settlements        
Purchases [3] 0 0 0 0
Issuances [3] 0 0 0 0
Sales [3] 0 [2] 0 0 [2] 0
Settlements [3] 0 (11) (3) (1,413)
Transfers in and/or out of Level 3 [3] 0 0 0 0
Balance at end of period [3] 3,444 3,555 3,444 3,555
Available for sale | Corporate bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 13 857 13 8,851
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 (5,872) 0 (5,865)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 6,936 0 397
Purchases, issuances, sales and settlements        
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 [2] 0 0 [2] 0
Settlements 0 0 0 (1,462)
Transfers in and/or out of Level 3 0 (1,908) 0 (1,908)
Balance at end of period 13 13 13 13
Fair value option | Corporate bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 998 998 985 932
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 (34) 13 (34)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 0 0 0 66
Issuances 0 0 0 0
Sales (998) [2] 0 (998) [2] 0
Settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period 0 964 0 964
Fair value option | Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 73,900 46,453 67,103 68,817
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 885 881 (129)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 0 22,436 13,003 22,460
Issuances 0 0 0 0
Sales (44,143) [2] (3,588) (51,230) [2] (27,946)
Settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 2,984
Balance at end of period 29,757 66,186 29,757 66,186
Fair value option | Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 73,678 61,447 68,988 58,094
Total gains or (losses) (realized/unrealized) - included in earnings [1] 38 2,076 4,728 5,429
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 (69,181) [2] 0 (69,181) [2] 0
Settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period 4,535 63,523 4,535 63,523
Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 49,136 51,981 42,015 55,889
Total gains or (losses) (realized/unrealized) - included in earnings [1] 11 (946) 1,837 7,132
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 208 0 5,503 3,464
Issuances 0 0 0 0
Sales (46,773) [2] (8,349) (46,773) [2] (23,799)
Settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period $ 2,582 $ 42,686 $ 2,582 $ 42,686
[1] Gains or losses were included in net realized gains (losses).
[2] Sales for the 2021 periods primarily related to the Company’s deconsolidation of Watford.
[3] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.