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Shareholders' equity (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders Equity Note [Abstract]  
Components of Changes in Accumulated Other Comprehensive Income (Loss) The components of and changes in accumulated other comprehensive income are as follows:

 

(U.S. Dollars, in thousands)

 

Currency

Translation

Adjustments

 

 

Debt Security

 

 

Accumulated Other

Comprehensive

Income (Loss)

 

Balance at December 31, 2016

 

$

(5,115

)

 

$

(1,465

)

 

$

(6,580

)

Other comprehensive income

 

 

4,552

 

 

 

3,830

 

 

 

8,382

 

Income taxes

 

 

—

 

 

 

(1,475

)

 

 

(1,475

)

Reclassification adjustments to:

 

 

 

 

 

 

 

 

 

 

 

 

Other expense, net

 

 

—

 

 

 

5,585

 

 

 

5,585

 

Income taxes

 

 

—

 

 

 

(2,125

)

 

 

(2,125

)

Balance at December 31, 2017

 

$

(563

)

 

$

4,350

 

 

$

3,787

 

Other comprehensive income (loss)

 

 

(1,823

)

 

 

1,770

 

 

 

(53

)

Income taxes

 

 

—

 

 

 

(438

)

 

 

(438

)

Balance at December 31, 2018

 

$

(2,386

)

 

$

5,682

 

 

$

3,296