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Summary of Investments (Net Realized Investment Gains and Losses and Proceeds) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net realized investment gains (losses):
Available-for-sale	$ (637)	$ (30)
Allowance for credit losses	(170)	(59)
Trading Securities	0	(2,457)
Equity securities	25,315	(90,828)
Mortgage loans allowance for credit losses	0	(5)
Real estate	0	(28)
Total net realized investment gains (losses)	24,508	(93,407)
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale of available-for-sale investments	99,682	11,910
Fixed maturities
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale of available-for-sale investments	31,091	11,910
Gross realized gains	1	172
Gross realized losses	$ 638	$ 382

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