Accumulated other comprehensive loss (Tables)

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Components of Changes in Accumulated Other Comprehensive Loss

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

(U.S. Dollars, in thousands)	Currency Translation Adjustments			Change in Fair Value of Derivatives		Change in Fair Value of Debt Securities			Accumulated Other Comprehensive Loss
Balance at December 31, 2015	$	(4,389	)	$	228	$	(2,071	)	$	(6,232	)
Unrealized gain on derivative instruments,    net of tax of $51		—			76		—			76
Unrealized loss on debt securities, net of tax benefit of $1,391		—			—		(2,469	)		(2,469	)
Foreign currency translation adjustment (1)		651			—		—			651
Balance at June 30, 2016	$	(3,738	)	$	304	$	(4,540	)	$	(7,974	)

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(1) As unremitted earnings generally remain indefinitely reinvested in the non U.S. dollar denominated foreign subsidiaries, no deferred taxes are recognized on the related foreign currency translation adjustment.