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Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent (Tables)
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31, 2013, 2012 and 2011:
(U.S. dollars in thousands, except per share amounts)
2013
 
2012
 
2011
Basic earnings per ordinary share and ordinary share equivalents outstanding:
 
 
Net income (loss) attributable to ordinary shareholders
$
1,059,916

 
$
651,128

 
$
(474,760
)
Weighted average ordinary shares outstanding
287,801

 
307,372

 
312,896

Basic earnings per ordinary share and ordinary share equivalents outstanding
$
3.68

 
$
2.12

 
$
(1.52
)
 
 
 
 
 
 
Diluted earnings per ordinary share and ordinary share equivalents outstanding:
 
 
Weighted average ordinary shares outstanding – basic
287,801

 
307,372

 
312,896

Impact of share based compensation and certain conversion features
4,268

 
2,910

 
—

Weighted average ordinary shares outstanding – diluted
292,069

 
310,282

 
312,896

Diluted earnings per ordinary share & ordinary share equivalents outstanding
$
3.63

 
$
2.10

 
$
(1.52
)
Dividends per ordinary share
$
0.56

 
$
0.44

 
$
0.44