v3.21.2
Investments - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value on Fixed Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Schedule of Investments [Line Items]    
Original or amortized cost $ 911,547 $ 1,163,923
Gross unrealized gains 32,200 53,055
Gross unrealized losses (5,062) (3,567)
Fixed maturities 938,685 1,213,411
U.S. treasury bonds    
Schedule of Investments [Line Items]    
Original or amortized cost 78,481 94,468
Gross unrealized gains 0 34
Gross unrealized losses (27) 0
Fixed maturities 78,454 94,502
U.S. agency bonds – mortgage-backed    
Schedule of Investments [Line Items]    
Original or amortized cost 148,520 272,124
Gross unrealized gains 5,028 9,439
Gross unrealized losses (95) (126)
Fixed maturities 153,453 281,437
Non-U.S. government bonds    
Schedule of Investments [Line Items]    
Original or amortized cost 3,167 8,641
Gross unrealized gains 273 1,067
Gross unrealized losses 0 0
Fixed maturities 3,440 9,708
Asset-backed securities    
Schedule of Investments [Line Items]    
Original or amortized cost 194,648 184,227
Gross unrealized gains 1,242 1,611
Gross unrealized losses (598) (406)
Fixed maturities 195,292 185,432
Corporate bonds    
Schedule of Investments [Line Items]    
Original or amortized cost 486,731 604,463
Gross unrealized gains 25,657 40,904
Gross unrealized losses (4,342) (3,035)
Fixed maturities $ 508,046 $ 642,332