Investments - Disposition of Fixed Income and Equity Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SALES | Debt Securities | Available for sale securities
Summary of the disposition of fixed income and equity securities
Proceeds From Sales	$ 65,262	$ 84,697	$ 196,799
Gross Realized Gains	2,161	5,454	4,368
Gross Realized Losses	(815)	(1,777)	(2,167)
Net Realized Gain (Loss)	1,346	3,677	2,201
SALES | Equity Securities
Summary of the disposition of fixed income and equity securities
Proceeds From Sales	180,256	79,368	62,172
Gross Realized Gains	64,298	25,338	16,938
Gross Realized Losses	(1,786)	(9,542)	(2,493)
Net Realized Gain (Loss)	62,512	15,796	14,445
CALLS/MATURITIES | Debt Securities | Available for sale securities
Summary of the disposition of fixed income and equity securities
Proceeds From Sales	376,751	283,107	201,698
Gross Realized Gains	638	821	1,004
Gross Realized Losses	(125)	(27)	(21)
Net Realized Gain (Loss)	$ 513	$ 794	$ 983