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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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The income earned from investments in securities and other investments including dividends, interest, and returns on other investments. This item does not include realized gains (losses).

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The income earned from investments in securities and other investments including dividends, interest, and returns on other investments, including realized gains/losses.

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Revenue from insurance services, including net premiums earned, gain on sale of insurance block, agency management fees and insurance contract fees and commissions.

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-SubTopic 225

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Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.

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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.

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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.

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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

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Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.

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