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Segment Information
 3 Months Ended
Mar. 31, 2013
Segment Information Statement [Abstract]  
Segment Information

7. Segment Information

The accounting policies of the segments are the same as those described in the Summary of Significant Accounting Policies in Note 2 of the consolidated financial statements accompanying the 2012 Annual Report. The Company measures segment performance primarily based on profit or loss from operations before income taxes. There are no intersegment reinsurance transactions and the Company does not have any material long-lived assets. Investment income is allocated to the segments based upon average assets and related capital levels deemed appropriate to support the segment business volumes.

The Company allocates capital to its segments based on an internally developed economic capital model, the purpose of which is to measure the risk in the business and to provide a basis upon which capital is deployed. The economic capital model considers the unique and specific nature of the risks inherent in the Company's businesses. As a result of the economic capital allocation process, a portion of investment income and investment related gains and losses are attributed to the segments based on the level of allocated capital. In addition, the segments are charged for excess capital utilized above the allocated economic capital basis. This charge is included in policy acquisition costs and other insurance expenses.

The Company's reportable segments are strategic business units that are primarily segregated by geographic region. Information related to revenues, income (loss) before income taxes and total assets of the Company for each reportable segment are summarized below (dollars in thousands).

 Three months ended March 31,  
Total revenues:2013 2012  
U.S.$ 1,500,264 $ 1,324,147  
Canada  297,089   275,623  
Europe & South Africa  339,229   308,337  
Asia Pacific  388,969   359,685  
Corporate and Other  75,551   25,183  
Total$ 2,601,102 $ 2,292,975  

 Three months ended March 31,  
Income (loss) before income taxes:2013 2012  
U.S.$ 174,409 $ 92,745  
Canada  36,308   55,063  
Europe & South Africa  17,385   6,606  
Asia Pacific  14,518   32,067  
Corporate and Other  36,207   (5,718)  
Total$ 278,827 $ 180,763  

       
Total Assets:March 31, 2013 December 31, 2012 
U.S.$ 24,802,143 $ 24,924,363 
Canada  3,946,500   3,764,002 
Europe & South Africa  2,137,397   2,235,199 
Asia Pacific  3,051,842   3,208,732 
Corporate and Other  6,259,219   6,228,142 
Total$ 40,197,101 $ 40,360,438