Fair Value - Rollforward of Level 3 assets and liabilities (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Contingent consideration liability
Level 3 liabilities rollforward
Balance at beginning of year		$ (16,960)	$ (461)
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	(364)	0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income		1,170	0
Purchases, issuances, sales and settlements
Purchases		0	(16,494)
Issuances		0	0
Sales		0	0	[2]
Settlements		1,908	(5)
Transfers in and/or out of Level 3		0	0
Balance at end of year		(14,246)	(16,960)
Equity securities
Level 3 assets rollforward
Balance at beginning of year		2,918	42,015
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	(470)	1,958
Total gains or (losses) (realized/unrealized) - included in other comprehensive income		0	0
Purchases, issuances, sales and settlements
Purchases		969	5,718
Issuances		0	0
Sales		(3)	(46,773)	[2]
Settlements		0	0
Transfers in and/or out of Level 3		0	0
Balance at end of year		3,414	2,918
Available for sale | Structured securities
Level 3 assets rollforward
Balance at beginning of year	[3]	3,347	3,426
Total gains or (losses) (realized/unrealized) - included in earnings	[1],[3]	(592)	(135)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income	[3]	(1)	133
Purchases, issuances, sales and settlements
Purchases	[3]	0	0
Issuances	[3]	0	0
Sales	[3]	(2,051)	0	[2]
Settlements	[3]	(703)	(77)
Transfers in and/or out of Level 3	[3]	0	0
Balance at end of year	[3]	0	3,347
Available for sale | Corporate bonds
Level 3 assets rollforward
Balance at beginning of year		13	13
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	352	0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income		(1,095)	0
Purchases, issuances, sales and settlements
Purchases		150,013	0
Issuances		0	0
Sales		(5,363)	0	[2]
Settlements		(26,250)	0
Transfers in and/or out of Level 3		3,557	0
Balance at end of year		121,227	13
Fair value option | Corporate bonds
Level 3 assets rollforward
Balance at beginning of year		0	985
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	0	13
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	(998)	[2]
Settlements		0	0
Transfers in and/or out of Level 3		0	0
Balance at end of year		0	0
Fair value option | Other investments
Level 3 assets rollforward
Balance at beginning of year		27,981	67,103
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	(781)	868
Total gains or (losses) (realized/unrealized) - included in other comprehensive income		0	0
Purchases, issuances, sales and settlements
Purchases		12,381	13,213
Issuances		0	0
Sales		(3,339)	(53,203)	[2]
Settlements		(2,983)	0
Transfers in and/or out of Level 3		0	0
Balance at end of year		33,259	27,981
Fair value option | Equity securities
Level 3 assets rollforward
Balance at beginning of year		4,748	68,988
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	(575)	4,941
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	(69,181)	[2]
Settlements		0	0
Transfers in and/or out of Level 3		0	0
Balance at end of year		$ 4,173	$ 4,748

[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