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Investments - Schedule of Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Due in one year or less	$ 36,505	$ 30,306
Due after one year through five years	167,610	149,378
Due after five years through ten years	38,340	26,621
Due after ten years	123,981	125,471
Asset-backed securities	40,233	37,975
Amortized Cost	406,669	369,751
Fair Value
Due in one year or less	36,902	30,602
Due after one year through five years	169,987	153,406
Due after five years through ten years	38,292	27,479
Due after ten years	126,244	129,454
Asset-backed securities	38,522	36,192
Fair Value	$ 409,947	$ 377,133

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