Investments - Unrealized Losses (Details) - Debt Securities - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Cost or amortized Cost
Total Cost or Amortized Cost	$ 417,126	$ 185,731
Fair value
Total Fair Value	409,354	183,177
Unrealized Loss
Total Unrealized Loss	$ (7,772)	$ (2,554)
Percent to Total	100.00%
NAIC Rating 1 | AAA/AA/A | Aaa/Aa/A
Cost or amortized Cost
Total Cost or Amortized Cost	$ 317,653
Fair value
Total Fair Value	311,305
Unrealized Loss
Total Unrealized Loss	$ (6,348)
Percent to Total	81.70%
NAIC Rating 2 | BBB | Baa
Cost or amortized Cost
Total Cost or Amortized Cost	$ 52,271
Fair value
Total Fair Value	51,646
Unrealized Loss
Total Unrealized Loss	$ (625)
Percent to Total	8.00%
NAIC Rating 3 | BB | Ba
Cost or amortized Cost
Total Cost or Amortized Cost	$ 21,538
Fair value
Total Fair Value	21,322
Unrealized Loss
Total Unrealized Loss	$ (216)
Percent to Total	2.80%
NAIC Rating 4 | B | B
Cost or amortized Cost
Total Cost or Amortized Cost	$ 24,385
Fair value
Total Fair Value	23,807
Unrealized Loss
Total Unrealized Loss	$ (578)
Percent to Total	7.40%
NAIC Rating 5 | CCC | Caa
Cost or amortized Cost
Total Cost or Amortized Cost	$ 1,279
Fair value
Total Fair Value	1,274
Unrealized Loss
Total Unrealized Loss	$ (5)
Percent to Total	0.10%
NAIC Six Rating Member | Standard Poors CC Or Lower Member | Ca
Unrealized Loss
Percent to Total	0.00%