v2.4.0.6

SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (DETAILS) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Schedule III - Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | $ 407,527 | $ 359,300 | $ 302,320
Reserve For Losses and Loss Expenses | 8,425,045 | 7,032,375 | 6,564,133
Unearned Premiums | 2,454,462 | 2,333,676 | 2,209,397
Net Premiums Earned | 3,314,961 | 2,947,410 | 2,791,764
Net Investment Income | 362,430 | 406,892 | 464,478
Losses and Loss Expenses | 2,675,052 | 1,677,132 | 1,423,872
Amortization of Deferred Acquisition Costs | 587,469 | 488,712 | 420,495
Other Operating Expenses | 459,151 | 449,885 | 370,157
Net Premiums Written | 3,419,434 | 3,147,540 | 2,816,429
Insurance [Member] |  |  |
Schedule III - Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 142,743 | 119,323 | 87,818
Reserve For Losses and Loss Expenses | 4,081,741 | 3,512,002 | 3,502,680
Unearned Premiums | 1,412,699 | 1,359,668 | 1,293,529
Net Premiums Earned | 1,429,687 | 1,206,493 | 1,157,966
Net Investment Income | 0 | 0 | 0
Losses and Loss Expenses | 919,319 | 569,869 | 612,694
Amortization of Deferred Acquisition Costs | 199,583 | 152,223 | 113,187
Other Operating Expenses | 278,147 | 276,435 | 216,954
Net Premiums Written | 1,466,134 | 1,332,220 | 1,025,061
Reinsurance [Member] |  |  |
Schedule III - Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 264,784 | 239,977 | 214,502
Reserve For Losses and Loss Expenses | 4,343,304 | 3,520,373 | 3,061,453
Unearned Premiums | 1,041,763 | 974,008 | 915,868
Net Premiums Earned | 1,885,274 | 1,740,917 | 1,633,798
Net Investment Income | 0 | 0 | 0
Losses and Loss Expenses | 1,755,733 | 1,107,263 | 811,178
Amortization of Deferred Acquisition Costs | 387,886 | 336,489 | 307,308
Other Operating Expenses | 103,915 | 98,001 | 76,127
Net Premiums Written | 1,953,300 | 1,815,320 | 1,791,368
Unallocated To Segment [Member] |  |  |
Schedule III - Supplementary Insurance Information [Line Items] |  |  |
Deferred Acquisition Costs | 0 | 0 | 0
Reserve For Losses and Loss Expenses | 0 | 0 | 0
Unearned Premiums | 0 | 0 | 0
Net Premiums Earned | 0 | 0 | 0
Net Investment Income | 362,430 | 406,892 | 464,478
Losses and Loss Expenses | 0 | 0 | 0
Amortization of Deferred Acquisition Costs | 0 | 0 | 0
Other Operating Expenses | 77,089 | 75,449 | 77,076
Net Premiums Written | $ 0 | $ 0 | $ 0

X
- Definition Amount of amortization of deferred policy acquisition costs recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
Name: | us-gaap_SupplementaryInsuranceInformationAmortizationOfDeferredPolicyAcquisitionCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of insurance benefits, claims, losses and settlement expenses incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
Name: | us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SupplementaryInsuranceInformationBySegmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force on the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
Name: | us-gaap_SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of reserves for future policy claims payable and loss expenses to be incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
Name: | us-gaap_SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of net investment income earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
Name: | us-gaap_SupplementaryInsuranceInformationNetInvestmentIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of other operating expense incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
Name: | us-gaap_SupplementaryInsuranceInformationOtherOperatingExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of premium revenue earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
Name: | us-gaap_SupplementaryInsuranceInformationPremiumRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of actual written premiums, including, as applicable, premiums from reinsurance assumed and net of premiums on reinsurance ceded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
Name: | us-gaap_SupplementaryInsuranceInformationPremiumsWritten
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of premiums not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
Name: | us-gaap_SupplementaryInsuranceInformationUnearnedPremiums
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant