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Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Calculation of earnings per share
The following table sets forth the computation of basic and diluted earnings per share for the three and six months ended June 30, 2013 and 2012:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(U.S. dollars in thousands, except per share amounts)
2013
 
2012
 
2013
 
2012
 
 
 
 
 
 
 
 
Basic earnings per ordinary share & ordinary share equivalents outstanding:
Net income (loss) attributable to ordinary shareholders
$
272,698

 
$
221,154

 
$
623,487

 
$
397,782

Weighted average ordinary shares outstanding - basic
289,513

 
309,765

 
292,277

 
312,442

Basic earnings per ordinary share & ordinary share equivalents outstanding
$
0.94

 
$
0.71

 
$
2.13

 
$
1.27

 
 
 
 
 
 
 
 
Diluted earnings per ordinary share & ordinary share equivalents outstanding:
Weighted average ordinary shares outstanding - basic
289,513

 
309,765

 
292,277

 
312,442

Impact of share-based compensation and certain conversion features
4,820

 
2,670

 
4,767

 
2,568

Weighted average ordinary shares outstanding - diluted
294,333

 
312,435

 
297,044

 
315,010

Diluted earnings per ordinary share & ordinary share equivalents outstanding
$
0.93

 
$
0.71

 
$
2.10

 
$
1.26

Dividends per ordinary share
$
0.14

 
$
0.11

 
$
0.28

 
$
0.22