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Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent
 9 Months Ended
Sep. 30, 2012
Earnings Per Share Abstract  
Earnings Per Share [Text Block]

11. Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent

            
(U.S. dollars in thousands, except per share amounts)Three Months Ended Nine Months Ended
Basic earnings per ordinary share &September 30, September 30, September 30, September 30,
ordinary share equivalents outstanding:2012 2011 2012 2011
 Net income (loss) attributable to ordinary shareholders$171,902 $42,398 $569,686 $40,777
 Weighted average ordinary shares outstanding - basic 304,199  311,714  309,675  310,793
 Basic earnings per ordinary share & ordinary share equivalents outstanding$0.57 $0.14 $1.84 $0.13
             
Diluted earnings per ordinary share &           
ordinary share equivalents outstanding:           
 Net income (loss) attributable to ordinary shareholders$171,902 $42,398 $569,686 $40,777
 Weighted average ordinary shares outstanding - basic 304,199  311,714  309,675  310,793
 Impact of share based compensation and certain conversion features 3,565  2,134  2,927  4,049
 Weighted average ordinary shares outstanding - diluted 307,764  313,848  312,602  314,842
 Diluted earnings per ordinary share & ordinary share equivalents outstanding$0.56 $0.14 $1.82 $0.13
Dividends per ordinary share$0.11 $0.11 $0.33 $0.33

For the three months ended September 30, 2012 and 2011, and for nine months ended September 30, 2012 and 2011, ordinary shares available for issuance under share based compensation plans of 8.6 million and 10.0 million, and 8.8 million and 10.0 million, respectively, were not included in the calculation of diluted earnings per share because the assumed exercise or issuance of such shares would be anti-dilutive.