Derivative instruments (Tables)

3 Months Ended

Mar. 31, 2014

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) As of March 31, 2014	Fair value: favorable (unfavorable)			Balance sheet location
Cross-currency swap	$	(1,035	)		Other long-term liabilities
As of December 31, 2013
Cross-currency swap	$	(1,036	)		Other long-term liabilities

Schedule of Gain (Loss) Recognized on Derivative Instruments

	Three Months Ended March 31,
(U.S. Dollars, in thousands)	2014		2013
Cross-currency swap unrealized gain (loss) recorded in other comprehensive income (loss), net of taxes	$	103	$	(318	)