Investments - Impairments on Available-For-Sale Securities and Agent Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale securities:
Intent to sell	$ 2,274	$ 195	$ 1,581
Credit impaired	707	0	0
Total available-for-sale securities	2,981	195	1,581
Agent loans - expected credit losses	297	0	0
Net impairment losses recognized in earnings	$ 3,278	$ 195	$ 1,581