Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Net premiums earned	$ 790,850	$ 745,520	$ 2,337,256	$ 2,197,803
Net investment income	30,371	30,898	91,440	94,101
Net realized investment losses	(15,465)	(26,286)	54,973	(75,595)
Other	2,406	2,281	6,416	6,823
Total revenues	808,162	752,413	2,490,085	2,223,132
Expenses:
Losses and loss adjustment expenses	576,316	545,692	1,765,484	1,581,306
Policy acquisition costs	140,203	132,881	421,685	401,868
Other operating expenses	59,006	60,788	178,000	191,017
Interest	1,012	785	2,922	2,304
Total expenses	776,537	740,146	2,368,091	2,176,495
Income before income taxes	31,625	12,267	121,994	46,637
Income tax expense (benefit)	4,695	(3,003)	22,868	(4,437)
Net income	$ 26,930	$ 15,270	$ 99,126	$ 51,074
Net income per share:
Basic (in dollars per share)	$ 0.49	$ 0.28	$ 1.79	$ 0.93
Diluted (in dollars per share)	$ 0.49	$ 0.28	$ 1.79	$ 0.93
Weighted average shares outstanding:
Basic (in shares)	55,259	55,164	55,238	55,154
Diluted (in shares)	55,328	55,178	55,304	55,172
Dividends paid per share (in dollars per share)	$ 620.0000	$ 0.6175	$ 1.86	$ 1.8525