Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
REVENUE:
Gross premiums written	$ 352,347	$ 210,756	$ 521,189	$ 346,712
Decrease in gross unearned premiums	(90,763)	(46,171)	(77,540)	(35,625)
Gross premiums earned	261,584	164,585	443,649	311,087
Ceded premiums earned	(101,966)	(50,406)	(176,848)	(95,538)
Net premiums earned	159,618	114,179	266,801	215,549
Investment income	4,637	2,727	7,588	5,123
Net realized gains (losses)	(132)	102	(483)	372
Other revenue	13,950	3,913	26,800	7,438
Total revenue	178,073	120,921	300,706	228,482
EXPENSES:
Losses and loss adjustment expenses	86,938	62,611	150,271	126,869
Policy acquisition costs	43,320	25,721	78,756	52,753
Operating expenses	6,257	5,814	12,129	9,768
General and administrative expenses	28,176	11,497	39,509	19,430
Interest expense	752	116	1,511	191
Total expenses	165,443	105,759	282,176	209,011
Income before other income	12,630	15,162	18,530	19,471
Other income	20	48	58	69
Income before income taxes	12,650	15,210	18,588	19,540
Provision for income taxes	5,393	5,369	7,432	6,748
Net income	7,257	9,841	11,156	12,792
OTHER COMPREHENSIVE INCOME:
Change in net unrealized gains (losses) on investments	4,106	7,420	7,837	13,800
Reclassification adjustment for net realized investment (gains) losses	132	(102)	483	(372)
Income tax benefit (expense) related to items of other comprehensive income	(1,615)	(2,713)	(3,157)	(5,074)
Total comprehensive income	$ 9,880	$ 14,446	$ 16,319	$ 21,146
Weighted-average shares outstanding
Weighted-average shares outstanding (in shares)	41,799,041	21,423,739	31,691,267	21,385,220
Weighted-average diluted shares (in shares)	42,028,013	21,631,077	31,914,559	21,584,287
Earnings Per Share
Basic earnings per share (in usd per share)	$ 0.17	$ 0.46	$ 0.35	$ 0.60
Diluted earnings per share (in usd per share)	0.17	0.45	0.35	0.59
Dividends declared per share (in usd per share)	$ 0.06	$ 0.06	$ 0.12	$ 0.11