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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Analysis of goodwill and intangible assets
The following table presents an analysis of goodwill, intangible assets with an indefinite life and intangible assets with a definite life for the six months ended June 30, 2018:
(U.S. dollars in thousands)
Goodwill
 
Intangible
assets with an
indefinite life
 
Intangible
assets with a
definite life
 
Total
Balance at December 31, 2017
$
1,234,150

 
$
699,014

 
$
292,587

 
$
2,225,751

Amortization
—

 
—

 
(10,091
)
 
(10,091
)
Foreign Currency Translation
(6,448
)
 
(5,608
)
 
(2,519
)
 
(14,575
)
Balance at June 30, 2018
$
1,227,702

 
$
693,406

 
$
279,977

 
$
2,201,085