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Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt and Equity Securities, Gain (Loss)
Gross realized gains	$ 614	$ 357
Gross realized losses	(111)	(425)
Net realized gains (losses)	503	(68)
Fair Value at Sale
Fair value at sale	63,216	59,540
Fair value at sale	30,506	5,599
Net fair value at sale	93,722	65,139
Fixed Maturities
Debt and Equity Securities, Gain (Loss)
Gross realized gains	612	345
Gross realized losses	(96)	(337)
Fair Value at Sale
Fair value at sale	56,137	59,225
Fair value at sale	24,426	4,518
Equity Securities
Debt and Equity Securities, Gain (Loss)
Gross realized gains	2	12
Gross realized losses	(2)	(88)
Fair Value at Sale
Fair value at sale	23	280
Fair value at sale	94	953
Short-term Investments
Debt and Equity Securities, Gain (Loss)
Gross realized gains	0	0
Gross realized losses	(13)	0
Fair Value at Sale
Fair value at sale	7,056	35
Fair value at sale	$ 5,986	$ 128

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