Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Net premiums earned	$ 507,390	$ 462,639	$ 1,473,822	$ 1,382,759
Net investment income earned	32,061	34,292	91,208	106,600
Net realized gains:
Net realized investment gains	1,590	15,231	23,598	28,370
Other-than-temporary impairments	(1,282)	0	(7,827)	(1,382)
Total net realized gains	308	15,231	15,771	26,988
Other income	698	3,196	5,521	14,931
Total revenues	540,457	515,358	1,586,322	1,531,278
Expenses:
Loss and loss expense incurred	285,161	270,932	861,721	889,273
Policy acquisition costs	174,802	158,101	509,295	462,540
Interest expense	5,489	5,558	16,458	16,544
Other expenses	9,166	5,441	29,954	22,990
Total expenses	474,618	440,032	1,417,428	1,391,347
Income before federal income tax	65,839	75,326	168,894	139,931
Federal income tax expense:
Current	9,141	7,373	29,128	22,692
Deferred	9,702	14,791	19,294	16,762
Total federal income tax expense	18,843	22,164	48,422	39,454
Net income	$ 46,996	$ 53,162	$ 120,472	$ 100,477
Earnings per share:
Basic net income	$ 0.82	$ 0.94	$ 2.11	$ 1.79
Diluted net income	0.81	0.93	2.08	1.75
Dividends to stockholders	$ 0.14	$ 0.13	$ 0.42	$ 0.39