Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net premiums written:
Direct	$ 243,390	$ 208,567	$ 677,414	$ 589,081
Ceded	(21,167)	(10,263)	(57,544)	(24,729)
Net premiums written	222,223	198,304	619,870	564,352
Net premiums earned:
Direct	243,425	213,736	697,769	594,483
Ceded	(21,167)	(10,263)	(57,544)	(24,729)
Net premiums earned	$ 222,258	$ 203,473	$ 640,225	$ 569,754