Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Operating activities
Net earnings	$ 176,905	$ 247,797
Adjustments to reconcile net earnings to net cash provided by operating activities
Change in premium, claims and other receivables	(76,927)	(36,040)
Change in reinsurance recoverables	(56,510)	(32,474)
Change in ceded unearned premium	47,477	(15,368)
Change in loss and loss adjustments expense payable	196,046	76,829
Change in unearned premium	24,655	30,471
Change in reinsurance, premium and claims payable, excluding restricted cash	(34,052)	11,501
Change in accounts payable and accrued liabilities	5,082	12,593
Stock-based compensation expense	10,017	9,441
Depreciation and amortization expense	13,214	12,894
Gain on investments	310	(8,086)
Other, net	(18,258)	5,073
Cash provided by operating activities	287,959	314,631
Investing activities
Proceeds from sales of available for sale fixed income securities	494,532	132,897
Maturity or call of available for sale fixed income securities	318,558	458,495
Maturity or call of held to maturity fixed income securities	24,950	25,187
Cost of available for sale fixed income securities acquired	(1,243,124)	(1,048,010)
Cost of held to maturity fixed income securities acquired	0	(115,215)
Cost of other investments acquired	(33,060)	0
Change in short-term investments	288,909	328,951
Payments for purchase of businesses, net of cash received	(1,892)	(36,348)
Proceeds from sale of subsidiaries and other investments	2,793	19,855
Other, net	(16,977)	(6,755)
Cash used by investing activities	(165,311)	(240,943)
Financing activities
Advances on line of credit	210,000	0
Payments on line of credit	(15,000)	0
Payments on convertible notes	0	(64,472)
Sale of common stock	36,245	18,639
Purchase of common stock	(303,311)	(11,444)
Dividends paid	(49,301)	(46,532)
Other, net	(6,001)	(1,126)
Cash used by financing activities	(127,368)	(104,935)
Net decrease in cash	(4,720)	(31,247)
Cash at beginning of year	97,857	129,460
Cash at end of period	$ 93,137	$ 98,213

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-URI http://asc.fasb.org/extlink&oid=6513228

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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Period Type:	duration