Accumulated other comprehensive loss (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Components of Changes in Accumulated Other Comprehensive Income (Loss)

The components of and changes in accumulated other comprehensive loss were as follows:

(U.S. Dollars, in thousands)	Currency Translation Adjustments			Debt Security			Accumulated Other Comprehensive Loss
Balance at December 31, 2016	$	(5,115	)	$	(1,465	)	$	(6,580	)
Other comprehensive income (loss)		3,993			(3,220	)		773
Income taxes		—			1,223			1,223
Reclassification adjustments to:
Other expense, net		—			5,585			5,585
Income taxes		—			(2,123	)		(2,123	)
Balance at September 30, 2017	$	(1,122	)	$	—		$	(1,122	)