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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill & intangible assets
The following table presents an analysis of intangible assets broken down between goodwill, intangible assets with an indefinite life and intangible assets with a definite life for the years ended December 31, 2014, 2013 and 2012:
(U.S. dollars in thousands)
Goodwill
 
Intangible
assets with an
indefinite life
 
Intangible
assets with a
definite life
 
Total
Balance at December 31, 2011
$
391,498

 
$
15,366

 
$
457

 
$
407,321

Amortization
—

 
—

 
(178
)
 
(178
)
Foreign Currency Translation
1,384

 
—

 
—

 
1,384

Balance at December 31, 2012
$
392,882

 
$
15,366

 
$
279

 
$
408,527

Amortization
—

 
—

 
(279
)
 
(279
)
Foreign Currency Translation
3,363

 
—

 
—

 
3,363

Balance at December 31, 2013
$
396,245

 
$
15,366

 
$
—

 
$
411,611

Additions
25,159

 
—

 
18,500

 
43,659

Amortization
—

 
—

 
(1,850
)
 
(1,850
)
Foreign Currency Translation
(5,468
)
 
—

 
—

 
(5,468
)
Balance at December 31, 2014
$
415,936

 
$
15,366

 
$
16,650

 
$
447,952