Consolidated Statement of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
REVENUE
Net earned premium	$ 556,668	$ 563,650	$ 1,679,210	$ 1,676,122
Other revenue	79,809	68,023	221,064	197,362
Net investment income	54,208	56,342	165,641	166,642
Other operating income	7,679	10,840	24,308	23,229
Net realized investment gain	17,922	1,472	31,115	8,519
Other-than-temporary impairment credit losses	0	(631)	0	(1,028)
Total revenue	636,477	631,673	1,900,274	1,873,484
EXPENSE
Net loss and loss adjustment expense	320,376	304,014	992,547	969,767
Policy acquisition costs, net	65,642	67,620	203,387	211,554
Other expense	176,001	174,040	491,400	498,819
Other operating expense	103,785	100,458	268,357	268,164
Interest expense	6,574	5,962	19,656	19,101
Total expense	496,377	478,054	1,483,947	1,468,586
Earnings before income taxes	140,100	153,619	416,327	404,898
Income tax expense	41,925	46,557	124,140	121,759
Net earnings	$ 98,175	$ 107,062	$ 292,187	$ 283,139
Earnings per common share
Basic	$ 0.98	$ 1.06	$ 2.91	$ 2.77
Diluted	$ 0.98	$ 1.05	$ 2.90	$ 2.76