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Costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with and are not primarily related to the acquisition or renewal of insurance contracts.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 7

-Article 7

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

-Topic 944

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-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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-Name Accounting Standards Codification

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-Topic 942

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written.

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The aggregate total amount of expenses directly related to the marketing or selling of products or services.

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No definition available.

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The difference between the price paid by the public and the contract price less the related expenses. A broker-dealer may underwrite a security offering by contracting to buy the issue either at a fixed price or a price based on selling the offering on a best-effort basis.

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

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-Topic 942

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-Name Accounting Standards Codification

-Topic 940

-SubTopic 605

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Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Written premiums: Direct									$ 1,227,645us-gaap_DirectPremiumsWritten	$ 1,268,698us-gaap_DirectPremiumsWritten	$ 1,074,206us-gaap_DirectPremiumsWritten
Net written premiums	1,294,247us-gaap_PremiumsWrittenNet	1,517,580us-gaap_PremiumsWrittenNet	1,217,487us-gaap_PremiumsWrittenNet	1,227,589us-gaap_PremiumsWrittenNet	1,253,355us-gaap_PremiumsWrittenNet	1,389,147us-gaap_PremiumsWrittenNet	1,212,626us-gaap_PremiumsWrittenNet	1,149,693us-gaap_PremiumsWrittenNet	5,256,903us-gaap_PremiumsWrittenNet	5,004,821us-gaap_PremiumsWrittenNet	4,081,071us-gaap_PremiumsWrittenNet
Premiums earned	1,362,330us-gaap_PremiumsEarnedNet	1,389,998us-gaap_PremiumsEarnedNet	1,272,317us-gaap_PremiumsEarnedNet	1,144,490us-gaap_PremiumsEarnedNet	1,287,496us-gaap_PremiumsEarnedNet	1,225,755us-gaap_PremiumsEarnedNet	1,151,533us-gaap_PremiumsEarnedNet	1,088,759us-gaap_PremiumsEarnedNet	5,169,135us-gaap_PremiumsEarnedNet	4,753,543us-gaap_PremiumsEarnedNet	4,164,628us-gaap_PremiumsEarnedNet
Incurred losses and LAE									2,906,534	2,800,251	2,745,265
Commission and brokerage									1,135,586us-gaap_SellingAndMarketingExpense	977,558us-gaap_SellingAndMarketingExpense	952,701us-gaap_SellingAndMarketingExpense
Other underwriting expenses									240,400us-gaap_OtherUnderwritingExpense	237,126us-gaap_OtherUnderwritingExpense	207,659us-gaap_OtherUnderwritingExpense
Underwriting gain (loss)									886,615us-gaap_UnderwritingIncomeLoss	738,608us-gaap_UnderwritingIncomeLoss	259,003us-gaap_UnderwritingIncomeLoss
U.S. Reinsurance [Member]
Segment Reporting Information [Line Items]
Written premiums: Direct									2,039,578	1,809,669	1,310,683
Net written premiums									1,983,800	1,807,067	1,306,463
Premiums earned									1,986,769	1,671,513	1,416,407
Incurred losses and LAE									954,525	814,668	1,050,394
Commission and brokerage									466,291	366,890	350,634
Other underwriting expenses									45,583	47,176	44,776
Underwriting gain (loss)									520,370	442,779	(29,397)
International [Member]
Segment Reporting Information [Line Items]
Written premiums: Direct									1,582,426	1,345,770	1,192,306
Net written premiums									1,336,633	1,327,430	1,188,745
Premiums earned									1,310,903	1,289,341	1,214,840
Incurred losses and LAE									748,174	675,362	586,325
Commission and brokerage									306,229	295,883	300,116
Other underwriting expenses									34,598	33,910	29,294
Underwriting gain (loss)									221,902	284,186	299,105
Bermuda [Member]
Segment Reporting Information [Line Items]
Written premiums: Direct									770,249	774,268	734,405
Net written premiums									744,664	765,660	733,751
Premiums earned									715,736	737,986	680,948
Incurred losses and LAE									361,792	374,375	408,230
Commission and brokerage									198,848	179,138	184,357
Other underwriting expenses									34,923	34,654	30,607
Underwriting gain (loss)									120,173	149,819	57,754
U.S Insurance [Member]
Segment Reporting Information [Line Items]
Written premiums: Direct									1,218,372	1,268,745	1,073,143
Net written premiums									1,067,333	1,086,217	852,112
Premiums earned									1,030,299	1,037,425	852,433
Incurred losses and LAE									811,445	931,466	700,316
Commission and brokerage									149,777	133,695	117,594
Other underwriting expenses									118,001	119,283	102,982
Underwriting gain (loss)									(48,924)	(147,019)	(68,459)
Mt. Logan Re [Member]
Segment Reporting Information [Line Items]
Written premiums: Direct									138,362	20,182
Net written premiums									124,473	18,447
Premiums earned									125,428	17,278
Incurred losses and LAE									30,598	4,380
Commission and brokerage									14,441	1,952
Other underwriting expenses									7,295	2,103
Underwriting gain (loss)									$ 73,094	$ 8,843