Consolidated Statement of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
REVENUE
Net earned premium	$ 563,650	$ 544,256	$ 1,676,122	$ 1,576,987
Other revenue	68,023	66,268	197,362	182,097
Net investment income	56,342	54,765	166,642	158,782
Other operating income	10,840	8,829	23,229	23,625
Net realized investment gain	1,472	2,674	8,519	3,169
Other-than-temporary impairment credit losses	(631)	0	(1,028)	(3,479)
Total revenue	631,673	610,524	1,873,484	1,759,084
EXPENSE
Loss and loss adjustment expense, net	304,014	380,372	969,767	1,062,240
Policy acquisition costs, net	67,620	57,496	211,554	193,180
Other expense	174,040	147,360	498,819	454,268
Other operating expense	100,458	84,254	268,164	244,491
Interest expense	5,962	5,610	19,101	16,597
Total expense	478,054	527,732	1,468,586	1,516,508
Earnings before income taxes	153,619	82,792	404,898	242,576
Income tax expense	46,557	22,355	121,759	65,671
Net earnings	$ 107,062	$ 60,437	$ 283,139	$ 176,905
Earnings per common share
Basic	$ 1.06	$ 0.56	$ 2.77	$ 1.58
Diluted	$ 1.05	$ 0.56	$ 2.76	$ 1.57