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Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt and Equity Securities, Gain (Loss)
Gross realized gains	$ 5,798	$ 27,432	$ 6,519	$ 28,975
Gross realized losses	(261)	(2,464)	(603)	(4,016)
Net realized gains (losses)	5,537	24,968	5,916	24,959
Fair Value at Sale
Fair value at sale	75,279	146,153	201,334	242,651
Fair value at sale	40,116	10,712	80,240	20,949
Net fair value at sale	115,395	156,865	281,574	263,600
Fixed Maturities
Debt and Equity Securities, Gain (Loss)
Gross realized gains	293	708	1,012	1,425
Gross realized losses	(236)	(45)	(544)	(439)
Fair Value at Sale
Fair value at sale	50,112	47,153	161,314	139,609
Fair value at sale	16,086	1,203	47,707	7,942
Equity Securities
Debt and Equity Securities, Gain (Loss)
Gross realized gains	5,505	26,724	5,507	27,550
Gross realized losses	0	(2,419)	(18)	(3,577)
Fair Value at Sale
Fair value at sale	10,512	97,725	10,535	101,696
Fair value at sale	56	9,509	575	12,879
Short-term Investments
Debt and Equity Securities, Gain (Loss)
Gross realized gains	0	0	0	0
Gross realized losses	(25)	0	(41)	0
Fair Value at Sale
Fair value at sale	14,655	1,275	29,485	1,346
Fair value at sale	$ 23,974	$ 0	$ 31,958	$ 128

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