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Schedule - Reinsurance (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Direct Amount | $ 1,693,021 | $ 1,654,301 | $ 1,657,911
Assumed From Other Companies | 29,011 | 26,619 | 21,501
Ceded To Other Companies | 282,719 | 264,322 | 248,365
Net Amount | 1,439,313 | 1,416,598 | 1,431,047
% of Amount Assumed To Net | 2.00% | 2.00% | 2.00%
Accident and Health Insurance Segment [Member] |  |  |
Direct Amount | 62 | 67 | 70
Assumed From Other Companies | 0 | 0 | 0
Ceded To Other Companies | 62 | 67 | 70
Net Amount | 0 | 0 | 0
% of Amount Assumed To Net | 0.00% | 0.00% | 0.00%
Property and liability insurance [Member] |  |  |
Direct Amount | 1,692,959 | 1,654,234 | 1,657,841
Assumed From Other Companies | 29,011 | 26,619 | 21,501
Ceded To Other Companies | 282,657 | 264,255 | 248,295
Net Amount | $ 1,439,313 | $ 1,416,598 | $ 1,431,047
% of Amount Assumed To Net | 2.00% | 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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