Industry Segments (Tables)

3 Months Ended

Mar. 31, 2013

Industry Segments Disclosure [Abstract]

Financial Information Of Company Operating Segments

	Revenues
(In thousands)	Earned Premiums		Investment Income		Other		Total		Pre-Tax Income (Loss)			Net Income (Loss)
Three months ended March 31, 2013:
Insurance-Domestic	$	884,378	$	97,797	$	26,736	$	1,008,911	$	141,350		$	99,408
Insurance-International	171,119		12,061		—		183,180		22,382			15,477
Reinsurance-Global	176,622		22,499		—		199,121		37,941			26,394
Corporate and eliminations (1)	—		3,572		92,016		95,588		(61,419		)	(37,644		)
Net investment gains	—		—		19,969		19,969		19,969			12,980
Total	$	1,232,119	$	135,929	$	138,721	$	1,506,769	$	160,223		$	116,615
Three months ended March 31, 2012:
Insurance-Domestic	$	810,069	$	112,086	$	23,877	$	946,032	$	147,735		$	105,880
Insurance-International	143,885		10,331		—		154,216		15,699			11,112
Reinsurance-Global	145,697		28,687		—		174,384		31,638			23,086
Corporate and eliminations (1)	—		6,515		50,067		56,582		(55,260		)	(35,842		)
Net investment gains	—		—		47,491		47,491		47,491			31,082
Total	$	1,099,651	$	157,619	$	121,435	$	1,378,705	$	187,303		$	135,318
Twelve months ended December 31, 2012:
Insurance-Domestic	$	3,417,022	$	424,787	$	103,133	$	3,944,942	$	578,500		$	412,514
Insurance-International	631,841		45,796		—		677,637		51,639			37,499
Reinsurance-Global	624,653		106,932		—		731,585		103,690			76,584
Corporate and eliminations (1)	—		9,248		249,677		258,925		(242,366		)	(152,807		)
Net investment gains	—		—		210,465		210,465		210,465			136,802
Total	$	4,673,516	$	586,763	$	563,275	$	5,823,554	$	701,928		$	510,592
Twelve months ended December 31, 2011:
Insurance-Domestic	$	3,121,281	$	372,053	$	92,847	$	3,586,181	$	467,126		$	344,521
Insurance-International	508,509		36,958		—		545,467		36,912			28,054
Reinsurance-Global	531,077		97,795		—		628,872		85,271			66,174
Corporate and eliminations (1)	—		19,545		250,438		269,983		(201,704		)	(129,185		)
Net investment gains	—		—		125,481		125,481		125,481			81,647
Total	$	4,160,867	$	526,351	$	468,766	$	5,155,984	$	513,086		$	391,211
Twelve months ended December 31, 2010:
Insurance-Domestic	$	2,963,486	$	385,783	$	85,417	$	3,434,686	$	589,138		$	425,337
Insurance-International	378,693		29,011		—		407,704		15,172			13,050
Reinsurance-Global	493,403		106,862		—		600,265		134,996			99,492
Corporate and eliminations (1)	—		8,869		215,964		224,833		(196,977		)	(128,348		)
Net investment gains	—		—		56,581		56,581		56,581			36,874
Total	$	3,835,582	$	530,525	$	357,962	$	4,724,069	$	598,910		$	446,405

Identifiable Assets By Segment

Identifiable assets by segment are as follows:

(Dollars in thousands)	March 31, 2013		December 31, 2012		December 31, 2011
Insurance-Domestic	$	14,023,370	$	14,661,476	$	13,126,472
Insurance-International	1,690,937		1,605,448		1,341,907
Reinsurance-Global	3,420,508		3,337,937		3,168,528
Corporate and eliminations	985,819		615,118		766,966
Total	$	20,120,634	$	20,155,896	$	18,403,873

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(1) Corporate and eliminations represent corporate revenues and expenses that are not allocated to business segments.

Net Premiums Earned By Major Line Of Business

Net premiums earned by major line of business are as follows:

	For the Three Months Ended
	March 31,
(In thousands)	2013		2012
Insurance-Domestic
Other liability	$	295,588	$	273,564
Workers’ compensation	229,011		189,544
Short-tail lines (1)	178,749		173,902
Commercial automobile	116,122		110,367
Products liability	64,908		62,692
Total	884,378		810,069
Insurance-International
Other liability	15,218		15,534
Workers’ compensation	22,889		18,618
Short-tail lines (1)	72,123		52,478
Commercial automobile	34,639		30,668
Products liability	26,250		26,587
Total	171,119		143,885
Reinsurance-Global
Casualty	121,327		105,089
Property	55,295		40,608
Total	176,622		145,697
Total	$	1,232,119	$	1,099,651