Fixed Maturity Securities in an Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) - External Credit Rating, Non Investment Grade $ in Thousands	Dec. 31, 2020 USD ($)
Foreign government
Debt Securities, Available-for-sale [Line Items]
Number of Securities	18
Aggregate Fair Value	$ 75,555
Gross Unrealized Loss	$ 44,310
Corporate
Debt Securities, Available-for-sale [Line Items]
Number of Securities	11
Aggregate Fair Value	$ 26,617
Gross Unrealized Loss	$ 3,025
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Number of Securities	7
Aggregate Fair Value	$ 1,393
Gross Unrealized Loss	$ 31
Debt Securities
Debt Securities, Available-for-sale [Line Items]
Number of Securities	36
Aggregate Fair Value	$ 103,565
Gross Unrealized Loss	$ 47,366