Investments, Variable Interest Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entities [Abstract]
Carrying amount of interest	$ 3,095	$ 3,238
Investment in unconsolidated trusts	1,238	1,238
VIE, Not Primary Beneficiary [Member] | Other Invested Assets [Member]
Variable Interest Entities [Abstract]
Carrying amount of interest	3,095	3,238
Investment in unconsolidated trusts	1,238	1,238
Maximum loss exposure	4,333	4,476
Outstanding commitments	$ 1,997	$ 1,997