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Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent (Tables)
 12 Months Ended
Dec. 31, 2016
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 common share for the years ended December 31, 2016, 2015 and 2014:
(U.S. dollars in thousands, except per share amounts)
2016
 
2015
 
2014
Basic earnings per common share and common share equivalents outstanding:
 
 
Net income (loss) attributable to common shareholders
$
440,968

 
$
1,207,152

 
$
188,340

Weighted average common shares outstanding
278,957

 
286,194

 
267,103

Basic earnings per common share and common share equivalents outstanding
$
1.58

 
$
4.22

 
$
0.71

 
 
 
 
 
 
Diluted earnings per common share and common share equivalents outstanding:
 
 
Weighted average common shares outstanding – basic
278,957

 
286,194

 
267,103

Impact of share-based compensation
3,801

 
4,805

 
4,424

Weighted average common shares outstanding – diluted
282,758

 
290,999

 
271,527

Diluted earnings per common share & common share equivalents outstanding
$
1.56

 
$
4.15

 
$
0.69

Dividends per common share
$
0.80

 
$
0.72

 
$
0.64