Investment in Life Insurance Policies - Portfolio Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) smoker life policy	Dec. 31, 2019 USD ($) policy
Investments, All Other Investments [Abstract]
Total life insurance portfolio face value of policy benefits	$ 1,921,067	$ 2,020,973
Average face value per policy	1,777
Average face value per insured life	$ 1,913
Weighted average age of insured	82 years 10 months 24 days
Weighted average life expectancy estimate	6 years 10 months 24 days
Total number of policies | policy	1,081	1,151
Number of unique lives | life	1,004
Demographics, percent male	74.00%
Demographics, percent female	26.00%
Number of smokers | smoker	43
Largest policy as % of total portfolio face value	0.70%
Average policy as % of total portfolio face value	0.10%
Average annual premium as % of face value	3.70%