Investments - OTTI in Earnings on Available-for-sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI recognized in earnings	$ 545	$ 161	$ 4,246	$ 161
Fixed Maturities | Investments in fixed-maturity securities not in default [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI recognized in earnings		158		158
Fixed Maturities | Investments in fixed-maturity securities in default [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI recognized in earnings		$ 3		$ 3