Schedule IV - Reinsurance

12 Months Ended

Dec. 31, 2011

Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]

Schedule IV - Reinsurance

Schedule IV

W. R. Berkley Corporation and Subsidiaries

Reinsurance

Years ended December 31, 2011, 2010 and 2009

(Amounts in thousands, other than percentages)

	Premiums Written
	Direct Amount		Ceded to Other Companies		Assumed from Other Companies		Net Amount		Percentage of Amount Assumed to Net
Year ended December 31, 2011:
Specialty	$	1,774,871	$	263,828	$	43,473	$	1,554,516	2.8	%
Regional	1,143,706		84,855		5,656		1,064,507		0.5
Alternative markets	760,339		208,059		66,817		619,097		10.8
Reinsurance	5,179		22,841		447,991		430,329		104.1
International	685,997		140,362		143,284		688,919		20.8
Total	$	4,370,092	$	719,945	$	707,221	$	4,357,368	16.2	%
Year ended December 31, 2010:
Specialty	$	1,492,589	$	214,025	$	33,267	$	1,311,831	2.5	%
Regional	1,155,970		115,789		4,166		1,044,347		0.4
Alternative markets	619,832		120,672		82,885		582,045		14.2
Reinsurance	3,803		24,058		421,494		401,239		105.0
International	516,057		90,607		86,014		511,464		16.8
Total	$	3,788,251	$	565,151	$	627,826	$	3,850,926	16.3	%
Year ended December 31, 2009:
Specialty	$	1,443,728	$	203,754	$	20,477	$	1,260,451	1.6	%
Regional	1,217,365		148,686		12,421		1,081,100		1.1
Alternative markets	567,767		75,112		96,982		589,637		16.4
Reinsurance	8,638		32,544		447,331		423,425		105.6
International	362,338		63,249		76,393		375,482		20.3
Total	$	3,599,836	$	523,345	$	653,604	$	3,730,095	17.5	%

See accompanying Report of Independent Registered Public Accounting Firm.