Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012		Jun. 30, 2013	Jun. 30, 2012
Revenues:
Net premiums earned	$ 675,787	$ 637,247		$ 1,338,382	$ 1,273,059
Net investment income	31,674	31,673		62,849	63,159
Net realized investment (losses) gains	(67,415)	(23,759)		(23,365)	28,904
Other	2,521	2,544		4,854	5,258
Total revenues	642,567	647,705		1,382,720	1,370,380
Expenses:
Losses and loss adjustment expenses	486,906	497,251		953,966	947,167
Policy acquisition costs	126,393	117,726		250,115	235,156
Other operating expenses	54,015	51,203		112,078	104,128
Interest	212	378		526	788
Total expenses	667,526	666,558		1,316,685	1,287,239
(Loss) income before income taxes	(24,959)	(18,853)		66,035	83,141
Income tax (benefit) expense	(15,695)	(13,589)		8,838	15,049
Net (loss) income	$ (9,264)	$ (5,264)		$ 57,197	$ 68,092
Net loss per share:
Basic (in dollars per share)	$ (0.17)	$ (0.10)		$ 1.04	$ 1.24
Diluted (in dollars per share)	$ (0.17)	$ (0.10)	[1]	$ 1.04	$ 1.24
Weighted average shares outstanding:
Basic (in shares)	54,941	54,895		54,931	54,886
Diluted (in shares)	54,941	54,895	[1]	54,948	54,915
Dividends paid per share (in dollars per share)	$ 0.6125	$ 0.61		$ 1.225	$ 1.22

[1] The dilutive impact of incremental shares is excluded from loss position in accordance with U.S. generally accepted accounting principles (“GAAP”).