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Derivative instruments (Tables) | 3 Months Ended
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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 |
Warrants |  | $ | 107 |  |  |  | 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 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 | )

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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=7476318&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=7476318&loc=SL5624171-113959 + Details
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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=7476318&loc=SL5624163-113959 + Details
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