Derivative instruments (Tables)

9 Months Ended

Sep. 30, 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 September 30, 2014	Fair value: favorable (unfavorable)			Balance sheet location
Cross-currency swap	$	1,838		Other long-term assets
Warrants	$	329		Other long-term assets
As of December 31, 2013
Cross-currency swap	$	(1,036	)	Other long-term liabilities
Warrants	$	107		Other long-term assets

Schedule of Gain (Loss) Recognized on Derivative Instruments

Three Months Ended September 30,					Nine Months Ended September 30,
(U.S. Dollars, in thousands)	2014		2013			2014		2013
Cross-currency swap and warrants unrealized gain (loss) recorded in other comprehensive income (loss), net of taxes	$	112	$	583		$	184	$	487