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Investments - Scheduled Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 83,740	$ 138,776
Due after one through five years	408,063	406,986
Due after five through ten years	373,220	380,737
Due after ten years	13,606	17,127
Asset-backed securities	180,514	170,153
Amortized Cost	1,059,143	1,113,779
Fair Value
Due in one year or less	83,736	139,113
Due after one through five years	415,419	417,208
Due after five through ten years	383,838	394,180
Due after ten years	13,972	17,797
Asset-backed securities	173,107	172,642
Fair Value	$ 1,070,072	$ 1,140,940

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