Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Net premiums written	$ 134,063	$ 108,513	$ 253,360	$ 208,979
Increase in unearned premiums	(7,500)	(7,802)	(9,146)	(13,865)
Net premiums earned	126,563	100,711	244,214	195,114
Net investment income	9,400	6,701	17,835	12,884
Realized investment gains, net	544	583	1,199	1,054
Other income	1,099	170	1,950	1,579
Total revenues	137,606	108,165	265,198	210,631
Losses and expenses:
Provision for losses and LAE	1,770	2,964	5,463	6,695
Other underwriting and operating expenses	35,686	31,409	72,018	62,797
Interest expense	1,189	0	1,905	0
Total losses and expenses	38,645	34,373	79,386	69,492
Income before income taxes	98,961	73,792	185,812	141,139
Income tax expense	26,843	21,534	47,096	40,930
Net income	$ 72,118	$ 52,258	$ 138,716	$ 100,209
Earnings per share:
Basic (in dollars per share)	$ 0.79	$ 0.57	$ 1.52	$ 1.10
Diluted (in dollars per share)	$ 0.77	$ 0.57	$ 1.49	$ 1.09
Weighted average shares outstanding:
Basic (in shares)	91,381	90,912	91,320	90,848
Diluted (in shares)	93,162	92,138	93,093	91,999
Net income	$ 72,118	$ 52,258	$ 138,716	$ 100,209
Other comprehensive income (loss):
Change in unrealized appreciation of investments, net of tax expense of $3,649 and $5,049 in the three months ended June 30, 2017 and 2016 and $5,710 and $10,763 in the six months ended June 30, 2017 and 2016	8,470	10,702	13,320	24,061
Total other comprehensive income	8,470	10,702	13,320	24,061
Comprehensive income	$ 80,588	$ 62,960	$ 152,036	$ 124,270