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Investments - Scheduled Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 99,314	$ 76,087
Due after one through five years	412,820	352,282
Due after five through ten years	300,990	318,728
Due after ten years	13,168	5,900
Asset-backed securities	168,251	171,990
Amortized Cost	994,543	924,987
Fair Value
Due in one year or less	99,375	76,104
Due after one through five years	420,131	347,701
Due after five through ten years	312,792	310,633
Due after ten years	13,878	5,727
Asset-backed securities	171,431	171,325
Fair Value	$ 1,017,607	$ 911,490

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