Investments - Schedule of Contract Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Cost or Amortized Cost
One year or less	$ 46,982
After one year through five years	481,646
After five years through ten years	210,431
After ten years	95,639
Residential mortgage-backed	249,452
Commercial mortgage and asset-backed	216,771
Redeemable preferred stock	2,025
Total fixed maturity securities, Cost or Amortized Cost	1,302,946	$ 1,199,409
Fair Value
One year or less	47,016
After one year through five years	490,856
After five years through ten years	218,335
After ten years	103,950
Residential mortgage-backed	249,758
Commercial mortgage and asset-backed	220,076
Redeemable preferred stock	2,051
Total investments available-for-sale, Fair Value	$ 1,332,042	$ 1,184,202