Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues:
Net premiums earned	$ 731,546	$ 697,889	$ 1,452,283	$ 1,381,590
Net investment income	31,697	30,850	63,203	61,092
Net realized investment (losses) gains	(39,348)	76,190	(49,309)	122,902
Other	2,276	2,090	4,542	4,391
Total revenues	726,171	807,019	1,470,719	1,569,975
Expenses:
Losses and loss adjustment expenses	521,214	483,043	1,035,614	959,646
Policy acquisition costs	135,140	133,060	268,987	262,874
Other operating expenses	64,537	53,792	130,229	107,796
Interest	769	688	1,519	1,193
Total expenses	721,660	670,583	1,436,349	1,331,509
Income before income taxes	4,511	136,436	34,370	238,466
Income tax (benefit) expense	(5,128)	41,476	(1,434)	70,857
Net income	$ 9,639	$ 94,960	$ 35,804	$ 167,609
Net income per share:
Basic (in dollars per share)	$ 0.17	$ 1.73	$ 0.65	$ 3.05
Diluted (in dollars per share)	$ 0.17	$ 1.73	$ 0.65	$ 3.05
Weighted average shares outstanding:
Basic (in shares)	55,160	54,978	55,149	54,977
Diluted (in shares)	55,179	54,989	55,169	54,988
Dividends paid per share (in dollars per share)	$ 0.6175	$ 0.6150	$ 1.235	$ 1.2300