Consolidated Statements Of Cash Flows (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 8,807	$ 16,887	$ (88,726)	$ (28,042)
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in premiums receivable	(17,216)	21,553	(128,544)	24,883
Decrease (increase) in funds held by reinsureds, net	(8,008)	(18,472)	(7,812)	(16,262)
Decrease (increase) in reinsurance receivables	(49,828)	(18,620)	(355,899)	(227,797)
Decrease (increase) in deferred tax asset	(19,965)	(46,121)	14,349	(54,415)
Decrease (increase) in prepaid reinsurance premiums	38,227	2,059	62,163	(16,192)
Increase (decrease) in reserve for losses and loss adjustment expenses	121,207	(12,762)	586,366	290,352
Increase (decrease) in unearned premiums	(80,213)	(10,237)	(103,362)	7,142
Change in equity adjustments in limited partnerships	(13,939)	(8,882)	(32,354)	(18,296)
Change in other assets and liabilities, net	32,717	16,395	103,464	142,621
Non-cash compensation expense	1,674	1,685	3,054	2,880
Amortization of bond premium (accrual of bond discount)	3,422	1,071	6,914	4,617
Amortization of underwriting discount on senior notes	12	11	24	53
Net realized capital (gains) losses	68,184	95,473	27,708	100,780
Net cash provided by (used in) operating activities	85,081	40,040	87,345	212,324
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from fixed maturities matured/called - available for sale, at market value	156,078	136,606	263,533	308,869
Proceeds from fixed maturities matured/called - available for sale, at fair value	5,875		12,775
Proceeds from fixed maturities sold - available for sale, at market value	270,169	206,078	786,890	371,563
Proceeds from fixed maturities sold - available for sale, at fair value	17,168	6,115	50,120	8,612
Proceeds from equity securities sold - available for sale, at market value			27,096
Proceeds from equity securities sold - available for sale, at fair value	37,000	51,400	89,696	72,742
Distributions from other invested assets	28,416	15,715	89,775	23,880
Cost of fixed maturities acquired - available for sale, at market value	(236,991)	(280,050)	(709,796)	(555,576)
Cost of fixed maturities acquired - available for sale, at fair value	(7,148)	(9,487)	(15,224)	(23,681)
Cost of equity securities acquired - available for sale, at market value			(27,059)
Cost of equity securities acquired - available for sale, at fair value	(212,606)	(30,140)	(339,271)	(50,879)
Cost of other invested assets acquired	(22,064)	(8,634)	(45,078)	(18,374)
Cost of other invested assets acquired, at fair value		(200,079)	(37,611)	(247,111)
Cost of businesses acquired			(63,100)
Net change in short-term investments	(196,488)	(2,164)	(47,185)	9,921
Net change in unsettled securities transactions	188,839	(51,843)	44,841	(35,520)
Net cash provided by (used in) investing activities	28,248	(166,483)	80,402	(135,554)
CASH FLOWS FROM FINANCING ACTIVITIES:
Tax benefit from share-based compensation	(40)	12	169	91
Net cost of senior notes maturing				(200,000)
Revolving credit borrowings		133,000	(10,000)	133,000
Net cash provided by (used in) financing activities	(40)	133,012	(9,831)	(66,909)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	5,711	(7,459)	12,357	(10,494)
Net increase (decrease) in cash	119,000	(890)	170,273	(633)
Cash, beginning of period	169,365	107,737	118,092	107,480
Cash, end of period	288,365	106,847	288,365	106,847
SUPPLEMENTAL CASH FLOW INFORMATION:
Income taxes paid (recovered)	(31,557)	(53,156)	(20,765)	(49,390)
Interest paid	19,838	19,866	25,041	33,765
Non-cash transaction:
Net assets acquired and liabilities assumed from business acquisitions			$ 19,130

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-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30

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The net amount paid (received) by the reporting entity through acquisition (sale/maturities) of short-term investments with an original maturity that is three months or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 95
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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15, 17

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 17
-Subparagraph b

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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- Definition

The net realized gains or losses on investments during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 3
-Subparagraph a
-Article 7

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, 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

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-Name Statement of Financial Accounting Standard (FAS)
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