Investments - Fixed Maturities, Allowance for Credit Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses beginning balance			$ 0
Additions to allowance for which credit losses were not previously recorded			33,000
Allowance for credit losses ending balance	$ 32,719		32,719
Corporates
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses beginning balance	31,854	$ 0	0	$ 0
Additions to allowance for which credit losses were not previously recorded	0	0	31,854	0
Additions (reductions) to allowance for fixed maturities that previously had an allowance	865	0	865	0
Reduction of allowance for which the Company intends to sell or more likely than not will be required to sell	0	0	0	0
Allowance for credit losses ending balance	$ 32,719	$ 0	$ 32,719	$ 0