Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Net premiums earned	$ 683,701	$ 662,595
Net investment income	30,242	31,175
Net realized investment gains	46,712	44,050
Other	2,301	2,333
Total revenues	762,956	740,153
Expenses:
Losses and loss adjustment expenses	476,603	467,060
Policy acquisition costs	129,814	123,722
Other operating expenses	54,004	58,063
Interest	505	314
Total expenses	660,926	649,159
Income before income taxes	102,030	90,994
Income tax expense	29,381	24,533
Net income	$ 72,649	$ 66,461
Net income per share:
Basic (in dollars per share)	$ 1.32	$ 1.21
Diluted (in dollars per share)	$ 1.32	$ 1.21
Weighted average shares outstanding:
Basic (in shares)	54,977	54,922
Diluted (in shares)	54,986	54,935
Dividends paid per share (in dollars per share)	$ 0.6150	$ 0.6125