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Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Calculation of earnings per share
The following table sets forth the computation of basic and diluted earnings per ordinary share for the three and six months ended June 30, 2015 and 2014:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(U.S. dollars in thousands, except per share amounts)
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
Basic earnings per ordinary share & ordinary share equivalents outstanding:
Net income (loss) attributable to ordinary shareholders
$
915,039

 
$
(279,260
)
 
$
951,320

 
$
(23,543
)
Weighted average ordinary shares outstanding, in thousands - basic
289,420

 
270,924

 
272,665

 
273,616

Basic earnings per ordinary share & ordinary share equivalents outstanding
$
3.16

 
$
(1.03
)
 
$
3.49

 
$
(0.09
)
 
 
 
 
 
 
 
 
Diluted earnings per ordinary share & ordinary share equivalents outstanding:
Weighted average ordinary shares outstanding, in thousands - basic
289,420

 
270,924

 
272,665

 
273,616

Impact of share-based compensation and certain conversion features, in thousands
4,563

 
—

 
4,808

 
—

Weighted average ordinary shares outstanding, in thousands - diluted
293,983

 
270,924

 
277,473

 
273,616

Diluted earnings per ordinary share & ordinary share equivalents outstanding
$
3.11

 
$
(1.03
)
 
$
3.43

 
$
(0.09
)
Dividends per ordinary share
$
0.16

 
$
0.16

 
$
0.32

 
$
0.32