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Revenue recognition and accounts receivable (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue Recognition And Accounts Receivable [Abstract]  
Schedule of Net Sales

The table below presents net sales, which includes product sales and marketing service fees, for each of the years ended December 31, 2019, 2018, and 2017.

 

 

For the year ended December 31,

 

(U.S. Dollars, in thousands)

 

2019

 

 

2018

 

 

2017

 

Product sales

 

$

397,064

 

 

$

395,589

 

 

$

373,538

 

Marketing service fees

 

 

62,891

 

 

 

57,453

 

 

 

60,285

 

Net sales

 

$

459,955

 

 

$

453,042

 

 

$

433,823