Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Net premiums earned	$ 745,520	$ 705,237	$ 2,197,803	$ 2,086,827
Net investment income	30,898	32,564	94,101	93,656
Net realized investment losses	(26,286)	(20,089)	(75,595)	102,813
Other	2,281	2,275	6,823	6,666
Total revenues	752,413	719,987	2,223,132	2,289,962
Expenses:
Losses and loss adjustment expenses	545,692	492,525	1,581,306	1,452,171
Policy acquisition costs	132,881	131,090	401,868	393,964
Other operating expenses	60,788	58,545	191,017	166,341
Interest	785	707	2,304	1,900
Total expenses	740,146	682,867	2,176,495	2,014,376
Income before income taxes	12,267	37,120	46,637	275,586
Income tax (benefit) expense	(3,003)	5,824	(4,437)	76,681
Net income	$ 15,270	$ 31,296	$ 51,074	$ 198,905
Net income per share:
Basic (in dollars per share)	$ 0.28	$ 0.57	$ 0.93	$ 3.62
Diluted (in dollars per share)	$ 0.28	$ 0.57	$ 0.93	$ 3.62
Weighted average shares outstanding:
Basic (in shares)	55,164	55,002	55,154	54,986
Diluted (in shares)	55,178	55,014	55,172	54,995
Dividends paid per share (in dollars per share)	$ 0.6175	$ 0.6150	$ 1.8525	$ 1.845