Schedule IV - Reinsurance

12 Months Ended

Dec. 31, 2012

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, 2012, 2011 and 2010

	Premiums Written
(In thousands, other than percentages)	Direct Amount		Ceded to Other Companies		Assumed from Other Companies		Net Amount		Percentage of Amount Assumed to Net
Year ended December 31, 2012:
Specialty	$	2,017,574	$	323,506	$	53,619	$	1,747,687	3.1	%
Regional	1,203,003		99,328		15,599		1,119,274		1.4
Alternative Markets	913,381		268,448		57,989		702,922		8.2
Reinsurance	21,941		31,465		486,776		477,252		102.0
International	808,170		158,593		201,827		851,404		23.7
Total	$	4,964,069	$	881,340	$	815,810	$	4,898,539	16.7	%
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	%

See accompanying Report of Independent Registered Public Accounting Firm.