Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Net premiums written	$ 119,297	$ 100,466
Increase in unearned premiums	(1,646)	(6,063)
Net premiums earned	117,651	94,403
Net investment income	8,435	6,183
Realized investment gains, net	655	471
Other income	851	1,409
Total revenues	127,592	102,466
Losses and expenses:
Provision for losses and LAE	3,693	3,731
Other underwriting and operating expenses	36,332	31,388
Interest expense	716	0
Total losses and expenses	40,741	35,119
Income before income taxes	86,851	67,347
Income tax expense	20,253	19,396
Net income	$ 66,598	$ 47,951
Earnings per share:
Basic (in dollars per share)	$ 0.73	$ 0.53
Diluted (in dollars per share)	$ 0.72	$ 0.52
Weighted average shares outstanding:
Basic (in shares)	91,258	90,785
Diluted (in shares)	93,023	91,859
Net income	$ 66,598	$ 47,951
Other comprehensive income (loss):
Change in unrealized appreciation of investments, net of tax expense of $2,061 in 2017 and $5,714 in 2016	4,850	13,359
Total other comprehensive income	4,850	13,359
Comprehensive income	$ 71,448	$ 61,310