Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Gross written premiums	$ 338,351	$ 260,166	$ 844,005	$ 563,908
Ceded written premiums	(81,587)	(55,025)	(221,507)	(118,808)
Net written premiums	256,764	205,141	622,498	445,100
Change in net unearned premiums	(54,648)	(71,992)	(81,618)	(76,266)
Net earned premiums	202,116	133,149	540,880	368,834
Net investment income	14,880	15,797	45,327	38,622
Net realized investment (losses) gains	(171)	210	1,183	2,376
Other income	4,041	2,209	12,272	7,373
Total revenues	220,866	151,365	599,662	417,205
Expenses
Losses and loss adjustment expenses	150,445	83,326	386,898	233,491
Other operating expenses	54,260	43,579	156,189	124,732
Other expenses	119	(43)	351	36
Interest expense	2,304	2,079	6,651	6,294
Amortization of intangible assets	149	149	447	447
Total expenses	207,277	129,090	550,536	365,000
Income before taxes	13,589	22,275	49,126	52,205
Income tax expense	3,238	909	5,784	3,406
Net income	10,351	21,366	43,342	48,799
Other comprehensive income:
Net unrealized gains (losses), net of taxes of $(136) and $2,535 in 2017 and $(373) and $2,271 in 2016	716	(1,672)	11,458	26,740
Total comprehensive income	$ 11,067	$ 19,694	$ 54,800	$ 75,539
Per share data:
Basic earnings per share (in dollars per share)	$ 0.35	$ 0.73	$ 1.47	$ 1.68
Diluted earnings per share (in dollars per share)	0.34	0.71	1.43	1.64
Dividend declared per share (in dollars per share)	$ 0.30	$ 0.20	$ 0.90	$ 0.60
Weighted-average common shares outstanding:
Basic (in shares)	29,524,243	29,101,550	29,407,762	29,030,284
Diluted (in shares)	30,220,077	29,935,152	30,285,733	29,834,686