Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data	3 Months Ended			9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Net premiums earned	$ 643,626		$ 642,558	$ 1,924,444	$ 1,925,889
Net investment income	35,526		35,992	106,631	108,353
Net realized investment (losses) gains	(66,919)		86,439	(14,465)	80,770
Other	3,508		1,761	11,221	5,234
Total revenues	615,741		766,750	2,027,831	2,120,246
Expenses:
Losses and loss adjustment expenses	458,530		440,566	1,356,329	1,310,797
Policy acquisition costs	121,016		125,001	365,649	380,308
Other operating expenses	53,027		63,711	166,797	191,551
Interest	1,286		1,633	4,650	5,103
Total expenses	633,859		630,911	1,893,425	1,887,759
(Loss) income before income taxes	(18,118)		135,839	134,406	232,487
Income tax (benefit) expense	(14,336)		38,990	22,711	56,642
Net (loss) income	$ (3,782)		$ 96,849	$ 111,695	$ 175,845
Net (loss) income per share:
Basic	$ (0.07)		$ 1.77	$ 2.04	$ 3.21
Diluted	$ (0.07)	[1]	$ 1.77	$ 2.04	$ 3.21
Weighted average shares outstanding:
Basic	54,826		54,795	54,818	54,789
Diluted	54,826	[1]	54,817	54,835	54,821
Dividends paid per share	$ 0.60		$ 0.59	$ 1.80	$ 1.77

[1] The dilutive impact of incremental shares for 2011 is excluded from loss position in accordance with U.S. generally accepted accounting principles.