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Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) (USD $) In Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Ceded premiums written | $ (74,629) | $ (62,336) | $ (141,789) | $ (127,323)
Ceded premiums earned | (68,748) | (64,087) | (136,173) | (128,461)
Ceded losses and loss expenses incurred | (26,147) | (20,002) | (50,178) | (68,120)
National Flood Insurance Program [Member] |  |  |  |
Ceded premiums written | (55,265) | (44,566) | (103,579) | (90,458)
Ceded premiums earned | (48,907) | (45,495) | (96,855) | (89,980)
Ceded losses and loss expenses incurred | $ (15,339) | $ (8,122) | $ (29,879) | $ (43,076)

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- Definition Premiums assumed and earned by another insurer as a result of reinsurance arrangements. + References 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 Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 16 + Details
Name: | us-gaap_CededPremiumsEarnedPropertyAndCasualty
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Premiums assumed for property and casualty insurance contracts by another insurer as a result of reinsurance arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 + Details
Name: | us-gaap_CededPremiumsWrittenPropertyAndCasualty
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The reduction in the amount of the provision for the period for claims and benefits incurred on contract risks ceded to other insurers under reinsurance arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27, 113 + Details
Name: | us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration