Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Gross written premiums	$ 293,378	$ 281,475	$ 591,494	$ 505,654
Ceded written premiums	(104,772)	(73,651)	(191,910)	(139,920)
Net written premiums	188,606	207,824	399,584	365,734
Change in net unearned premiums	19,604	(23,747)	9,568	(26,970)
Net earned premiums	208,210	184,077	409,152	338,764
Net investment income	16,135	13,714	29,391	30,447
Net realized and unrealized (losses) gains on investments	(64)	307	(874)	1,354
Other income	3,760	4,296	8,716	8,231
Total revenues	228,041	202,394	446,385	378,796
Expenses
Losses and loss adjustment expenses	154,595	131,084	298,367	236,453
Other operating expenses	51,751	53,036	106,534	101,929
Other expenses	93	346	97	232
Interest expense	2,946	2,224	5,468	4,347
Amortization of intangible assets	149	149	298	298
Total expenses	209,534	186,839	410,764	343,259
Income before taxes	18,507	15,555	35,621	35,537
Income tax expense	1,523	1,014	3,004	2,546
Net income	16,984	14,541	32,617	32,991
Other comprehensive (loss) income:
Net unrealized (losses) gains, net of taxes of $(183) and $(727) in 2018 and $1,157 and $2,671 in 2017	(6,558)	6,708	(25,105)	10,742
Total comprehensive income	$ 10,426	$ 21,249	$ 7,512	$ 43,733
Per share data:
Basic earnings per share (in dollars per share)	$ 0.57	$ 0.49	$ 1.09	$ 1.12
Diluted earnings per share (in dollars per share)	0.56	0.48	1.08	1.09
Dividend declared per share (in dollars per share)	$ 0.30	$ 0.30	$ 0.60	$ 0.60
Weighted-average common shares outstanding:
Basic (in shares)	29,882,988	29,406,877	29,823,982	29,348,557
Diluted (in shares)	30,293,933	30,307,099	30,243,946	30,317,585