Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Net premiums written	$ 100,466	$ 82,257
Increase in unearned premiums	(6,063)	(7,219)
Net premiums earned	94,403	75,038
Net investment income	6,183	4,280
Realized investment gains, net	471	649
Other income	1,409	44
Total revenues	102,466	80,011
Losses and expenses:
Provision for losses and LAE	3,731	1,999
Other underwriting and operating expenses	31,388	27,498
Total losses and expenses	35,119	29,497
Income before income taxes	67,347	50,514
Income tax expense	19,396	15,676
Net income	$ 47,951	$ 34,838
Earnings per share:
Basic (in dollars per share)	$ 0.53	$ 0.39
Diluted (in dollars per share)	$ 0.52	$ 0.38
Weighted average shares outstanding:
Basic (in shares)	90,785	90,185
Diluted (in shares)	91,859	91,514
Net income	$ 47,951	$ 34,838
Other comprehensive income:
Change in unrealized appreciation of investments, net of tax expense of $5,714 in 2016 and $2,110 in 2015	13,359	4,889
Total other comprehensive income	13,359	4,889
Comprehensive income	$ 61,310	$ 39,727