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Derivative instruments (Tables)

3 Months Ended

Mar. 31, 2015

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 loss (“OCI”).  The ineffective portions of these instruments totaling $3.0 million and $0.1 million for the three months ended March 31, 2015 and 2014, respectively, are recognized in other income (expense).

(U.S. Dollars, in thousands) As of March 31, 2015		Fair value: favorable (unfavorable)				Balance sheet location
Cross-currency swap		$	6,161			Other long-term assets
Warrants		$	311			Other long-term assets
As of December 31, 2014
Cross-currency swap		$	2,504			Other long-term assets
Warrants		$	321			Other long-term assets

Schedule of Gain (Loss) Recognized on Derivative Instruments

		Three Months Ended March 31,
(U.S. Dollars, in thousands)		2015				2014
Cross-currency swap unrealized gain recorded in other    comprehensive loss, net of taxes		$	669			$	103
Warrants unrealized loss recorded in other    comprehensive loss, net of taxes		$	(4	)		$	—

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- Definition

Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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- Definition

Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

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