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Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities
Gross Realized Gains	$ 70,785	$ 1,772	$ 3,201
Fair Value at Sale	811,260	213,979	47,849
Gross Realized Losses	(4,094)	(544)	(1,546)
Fair Value at Sale	31,615	45,995	136,939
Net realized gains (losses)	66,691	1,228	1,655
Net Fair Value at Sale	842,875	259,974	184,788
Fixed Maturities
Schedule of Available-for-sale Securities
Gross Realized Gains	32,460	1,678	373
Fair Value at Sale	678,736	209,302	41,776
Gross Realized Losses	(478)	(324)	(1,376)
Fair Value at Sale	16,552	43,573	135,944
Equity Securities
Schedule of Available-for-sale Securities
Gross Realized Gains	38,325	94	2,828
Fair Value at Sale	131,178	814	6,073
Gross Realized Losses	(3,602)	(219)	(170)
Fair Value at Sale	13,805	1,387	995
Short-term Investments
Schedule of Available-for-sale Securities
Gross Realized Gains	0	0	0
Fair Value at Sale	1,346	3,863	0
Gross Realized Losses	(14)	(1)	0
Fair Value at Sale	$ 1,258	$ 1,035	$ 0

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