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Acquisition-Related Amortization and Remeasurement (Tables)
 12 Months Ended
Dec. 31, 2020
Acquisition Related Amortization And Remeasurement [Abstract]  
Components of Acquisition-Related Amortization and Remeasurement Components of acquisition-related amortization and remeasurement for the twelve months ended December 31, 2020, 2019, and 2018, respectively, are as follows:

 

 

Year Ended December 31,

 

(U.S. Dollars, in thousands)

 

2020

 

 

2019

 

 

2018

 

Changes in fair value of contingent consideration

 

$

(7,300

)

 

$

29,140

 

 

$

3,069

 

Amortization of acquired intangibles

 

 

6,801

 

 

 

5,072

 

 

 

1,255

 

Total

 

$

(499

)

 

$

34,212

 

 

$

4,324