Segments (Tables)

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Segments [Abstract]

Information by business segment

			U.S. Property & Casualty		Professional Liability		Accident & Health		U.S. Surety & Credit		International		Investing		Corporate & Other		Consolidated
Year ended December 31, 2012
Net earned premium			$	354,050	$	394,687	$	831,827	$	207,955	$	412,853	$	0	$	41,253	$	2,242,625
Other revenue				18,865		731		4,918		843		5,005		252,754		86		283,202
	Segment revenue			372,915		395,418		836,745		208,798		417,858		252,754		41,339		2,525,827
Loss and LAE				209,286		229,873		601,076		38,535		189,410		0		37,331		1,305,511
Other expense				116,398		66,721		122,232		113,619		146,807		0		100,112		665,889
	Segment expense			325,684		296,594		723,308		152,154		336,217		-		137,443		1,971,400
		Segment pretax earnings (loss)	$	47,231	$	98,824	$	113,437	$	56,644	$	81,641	$	252,754	$	(96,104)	$	554,427

Year ended December 31, 2011
Net earned premium			$	333,410	$	410,816	$	758,270	$	210,535	$	368,748	$	0	$	45,391	$	2,127,170
Other revenue				23,951		912		4,684		1,247		5,309		211,245		(513)		246,835
	Segment revenue			357,361		411,728		762,954		211,782		374,057		211,245		44,878		2,374,005
Loss and LAE				201,017		328,503		552,292		52,206		233,879		0		31,350		1,399,247
Other expense				110,184		59,036		116,336		113,932		136,750		0		83,514		619,752
	Segment expense			311,201		387,539		668,628		166,138		370,629		-		114,864		2,018,999
		Segment pretax earnings (loss)	$	46,160	$	24,189	$	94,326	$	45,644	$	3,428	$	211,245	$	(69,986)	$	355,006

Total assets by segment

	2012		2011
U.S. Property & Casualty	$	859,597	$	938,265
Professional Liability		1,053,024		1,026,639
Accident & Health		243,023		236,811
U.S. Surety & Credit		162,817		157,037
International		658,632		722,933
Investing		7,018,747		6,119,288
Corporate & Other		271,967		396,305
Total	$	10,267,807	$	9,597,278

Revenue, pretax earnings and total assets by geographical location

	2012		2011		2010
Domestic	$	1,880,954	$	1,779,789	$	1,785,865
Foreign		644,873		594,216		516,389
Total revenue	$	2,525,827	$	2,374,005	$	2,302,254
Domestic	$	364,083	$	237,056	$	347,841
Foreign		190,344		117,950		141,986
Total pretax earnings	$	554,427	$	355,006	$	489,827

	December 31,
	2012		2011
Domestic	$	7,536,285	$	7,232,177
Foreign		2,731,522		2,365,101
Total assets	$	10,267,807	$	9,597,278

			U.S. Property & Casualty		Professional Liability		Accident & Health		U.S. Surety & Credit		International		Investing		Corporate & Other		Consolidated
Year ended December 31, 2010
Net earned premium			$	339,513	$	425,226	$	705,408	$	199,908	$	316,186	$	0	$	55,683	$	2,041,924
Other revenue				31,201		981		3,872		580		7,344		215,498		854		260,330
	Segment revenue			370,714		426,207		709,280		200,488		323,530		215,498		56,537		2,302,254
Loss and LAE				191,108		265,465		506,994		52,940		143,412		0		53,110		1,213,029
Other expense				103,229		74,524		110,942		109,685		120,956		0		80,062		599,398
	Segment expense			294,337		339,989		617,936		162,625		264,368		-		133,172		1,812,427
		Segment pretax earnings (loss)	$	76,377	$	86,218	$	91,344	$	37,863	$	59,162	$	215,498	$	(76,635)	$	489,827