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Schedule V - Reinsurance (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Direct Amount | $ 1,873,007 | $ 1,693,021 | $ 1,654,301
Assumed From Other Companies | 65,884 | 29,011 | 26,619
Ceded To Other Companies | 354,772 | 282,719 | 264,322
Net Amount | 1,584,119 | 1,439,313 | 1,416,598
% of Amount Assumed To Net | 4.00% | 2.00% | 2.00%
Accident and Health Insurance Segment [Member] |  |  |
Direct Amount | 58 | 62 | 67
Assumed From Other Companies | 0 | 0 | 0
Ceded To Other Companies | 58 | 62 | 67
Net Amount | 0 | 0 | 0
% of Amount Assumed To Net | 0.00% | 0.00% | 0.00%
Property and liability insurance [Member] |  |  |
Direct Amount | 1,872,949 | 1,692,959 | 1,654,234
Assumed From Other Companies | 65,884 | 29,011 | 26,619
Ceded To Other Companies | 354,714 | 282,657 | 264,255
Net Amount | $ 1,584,119 | $ 1,439,313 | $ 1,416,598
% of Amount Assumed To Net | 4.00% | 2.00% | 2.00%

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- Definition Amount of premiums assumed from other companies. + 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 Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Amount of premiums ceded to other companies. + 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 Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Gross amount of premium revenue. + 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 Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Net amount of gross premiums, less premiums ceded to other companies, plus premiums assumed from other companies; which represents the net amount of premium revenue on the income statement. + 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 Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Percentage of amount of premiums assumed from other companies to net amount of premiums. + 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 Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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