Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Consolidated Statements of Operations [Abstract]
Gross premiums written	$ 218,236	$ 173,219	$ 405,552	$ 326,724
Ceded premiums written	(94,393)	(83,373)	(164,306)	(145,445)
Net premiums written	123,843	89,846	241,246	181,279
Change in unearned premiums	(17,344)	1,132	(35,717)	1,646
Net premiums earned	106,499	90,978	205,529	182,925
Investment income, net of expenses	5,412	4,406	10,523	8,846
Investment gains (losses), net	6,817	533	18,754	(4,302)
Finance charges	1,797	1,161	3,531	2,201
Commission and fees	364	1,032	657	1,735
Other income	14	15	30	61
Total revenues	120,903	98,125	239,024	191,466
Losses and loss adjustment expenses	73,226	63,648	143,313	127,323
Operating expenses	29,336	26,360	56,582	53,573
Interest expense	1,240	1,128	2,493	2,155
Amortization of intangible assets	617	617	1,234	1,234
Total expenses	104,419	91,753	203,622	184,285
Income before tax	16,484	6,372	35,402	7,181
Income tax expense	3,455	1,282	7,348	1,444
Net income	$ 13,029	$ 5,090	$ 28,054	$ 5,737
Net income per share:
Basic (in dollars per share)	$ 0.72	$ 0.28	$ 1.55	$ 0.32
Diluted (in dollars per share)	$ 0.71	$ 0.28	$ 1.54	$ 0.31