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Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent
 6 Months Ended
Jun. 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 Six Months Ended
Basic earnings per ordinary share &June 30, June 30, June 30, June 30,
ordinary share equivalents outstanding:2012 2011 2012 2011
 Net income (loss) attributable to ordinary shareholders$221,156 $225,663 $397,784 $(1,621)
 Weighted average ordinary shares outstanding 309,765  309,184  312,442  310,325
 Basic earnings per ordinary share & ordinary share equivalents outstanding$0.71 $0.73 $1.27 $(0.01)
             
Diluted earnings per ordinary share &           
ordinary share equivalents outstanding:           
 Net income (loss) attributable to ordinary shareholders$221,156 $225,663 $397,784 $(1,621)
 Impact of assumed conversion of 10.75% Units -  11,977  -  -
 Net income (loss) attributable to ordinary shareholders including impact of assumed conversion of 10.75% Units$221,156 $237,640 $397,784 $(1,621)
 Weighted average ordinary shares outstanding - basic 309,765  309,184  312,442  310,325
 Impact of share based compensation and certain conversion features 2,670  32,805  2,568  -
 Weighted average ordinary shares outstanding - diluted 312,435  341,989  315,010  310,325
 Diluted earnings per ordinary share & ordinary share equivalents outstanding$0.71 $0.69 $1.26 $(0.01)
Dividends per ordinary share$0.11 $0.11 $0.22 $0.22

For the three and six months ended June 30, 2012 and 2011, ordinary shares available for issuance under share based compensation plans of 8.8 million and 9.0 million, and 9.7 million and 17.3 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.

In addition, for the six months ended June 30, 2011, ordinary shares available for issuance under the purchase contracts associated with the 10.75% Units of 30.5 million were not included in the calculation of diluted earnings per share because the assumed issuance of such shares would be anti-dilutive. For further information on the 10.75% Units see Item 8, Note 15, “Notes Payable and Debt Financing Arrangements,” to the Consolidated Financial Statements in the Company's Annual Report on form 10-K for the year ended December 31, 2011.