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Fair value measurements (Tables) | 12 Months Ended
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Dec. 31, 2012
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Recorded at Fair Value on Recurring Basis | The fair value of the Company’s financial assets and liabilities on a recurring basis were as follows:
(U.S. Dollars, in thousands) |  | Balance December 31, 2012 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Derivative Financial Instruments (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross currency hedge |  | $ | 305 |  |  | $ | — |  |  | $ | 305 |  |  | $ | — |
(U.S. Dollars, in thousands) |  | Balance December 31, 2011 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Derivative Financial Instruments (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross currency hedge |  | $ | 1,011 |  |  | $ | — |  |  | $ | 1,011 |  |  | $ | — |
(1) | See Note 10, “Derivative Instruments”.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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