Derivative instruments (Tables)

12 Months Ended

Dec. 31, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Schedule of Fair Values of Derivative Instruments

The tables below disclose the types of derivative instruments the Company owns, the classifications and fair values of these instruments within the balance sheet, and the amount of gain (loss) recognized in other comprehensive income (loss) (“OCI”) or net income (loss).

(U.S. Dollars in thousands)	Fair value: favorable (unfavorable)			Balance sheet location
As of December 31, 2013
Cross-currency swap	$	(1,036	)	Other long-term liabilities
As of December 31, 2012
Cross-currency swap	$	305		Other long-term assets

Schedule of Gain (Loss) Recognized on Derivative Instruments

For the year ended December 31,
(U.S. Dollars in thousands)	2013			2012		2011
Cross-currency swap gain (loss) recorded in other comprehensive income (loss), net of taxes	$	(278	)	$	263	$	(437	)