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Schedule IV - Supplementary Reinsurance Information
 12 Months Ended
Dec. 31, 2014
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]  
Schedule IV - Supplementary reinsurance information
Schedule IV
ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG
SUPPLEMENTARY REINSURANCE INFORMATION
(Expressed in thousands of United States dollars)
Property and Casualty:
(a)
Gross

(b)
Ceded to
Other
Companies

(c)
Assumed from
Other
Companies

(d)
Net
Amount
(a) - (b) +
(c)

Percentage of
Amount Assumed
to Net
(c) / (d)
Year Ended December 31, 2014
$
1,996,831

 
$
613,350

 
$
938,594


$
2,322,075


40%
Year Ended December 31, 2013
$
1,804,910

 
$
618,183

 
$
933,754


$
2,120,481


44%
Year Ended December 31, 2012
$
1,569,021

 
$
491,448

 
$
760,250


$
1,837,823


41%