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Segment Information (Revenue From Continuing Operations by Segment) (Details) (USD $) In Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Total net premiums earned | $ 358,963 | $ 354,709 | $ 1,065,886 | $ 1,063,101
Other income | 1,365 | 1,950 | 6,744 | 6,465
Total Insurance Operations revenues | 360,218 | 356,625 | 1,072,299 | 1,069,514
Net investment income | 35,786 | 32,986 | 118,604 | 104,237
Net realized (loss) gain on investments | (2,045) | 57 | 5,861 | (3,271)
Total investment income, before federal income tax | 33,741 | 33,043 | 124,465 | 100,966
Total all segments | 393,959 | 389,668 | 1,196,764 | 1,170,480
Total revenues | 394,069 | 389,702 | 1,197,095 | 1,170,532
Commercial Automobile [Member] |  |  |  |
Total net premiums earned | 70,174 | 73,440 | 209,042 | 220,932
Workers Compensation [Member] |  |  |  |
Total net premiums earned | 63,497 | 63,165 | 189,878 | 189,875
General Liability [Member] |  |  |  |
Total net premiums earned | 87,479 | 83,250 | 255,717 | 252,438
Commercial Property [Member] |  |  |  |
Total net premiums earned | 48,051 | 49,558 | 144,121 | 150,188
Business Owners Policies [Member] |  |  |  |
Total net premiums earned | 16,663 | 16,400 | 49,555 | 48,838
Bonds Segment [Member] |  |  |  |
Total net premiums earned | 4,727 | 4,884 | 14,219 | 14,315
Other Commercial [Member] |  |  |  |
Total net premiums earned | 1,772 | 2,528 | 6,889 | 7,548
Total Commercial Lines [Member] |  |  |  |
Total net premiums earned | 292,363 | 293,225 | 869,421 | 884,134
Personal Automobile [Member] |  |  |  |
Total net premiums earned | 37,371 | 35,927 | 111,522 | 105,490
Homeowners [Member] |  |  |  |
Total net premiums earned | 25,923 | 22,544 | 75,538 | 64,163
Other Personal [Member] |  |  |  |
Total net premiums earned | 3,306 | 3,013 | 9,405 | 9,314
Total Personal Lines [Member] |  |  |  |
Total net premiums earned | 66,600 | 61,484 | 196,465 | 178,967
Miscellaneous Income [Member] |  |  |  |
Other income | 1,255 | 1,916 | 6,413 | 6,413
Other Income [Member] |  |  |  |
Other income | $ 110 | $ 34 | $ 331 | $ 52

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- Definition Revenue from insurance services, including net premiums earned, gain on sale of insurance block, agency management fees and insurance contract fees and commissions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1,4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Premiums recognized as revenue in the period earned on all property and casualty insurance and reinsurance contracts after subtracting any amounts ceded to another insurer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Subparagraph a -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 + Details
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