Reinsurance - Summary of Premiums Earned and Losses Incurred (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Premiums earned:
Direct	$ 296,271	$ 289,868
Assumed	2,411	2,609
Ceded	(43,637)	(31,576)
Net premiums earned	255,045	260,901
Losses incurred:
Direct	48,071	66,562
Assumed	(25)	166
Ceded	(8,410)	(5,772)
Losses incurred, net	$ 39,636	$ 60,956

Amount of earned premiums assumed from other entities.

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