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Accumulated other comprehensive loss (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Components of Changes in Accumulated Other Comprehensive Income (Loss) | The components of and changes in accumulated other comprehensive loss were as follows:
(U.S. Dollars, in thousands) |  | Currency Translation Adjustments |  |  | Debt Security |  |  | Accumulated Other Comprehensive Loss |
Balance at December 31, 2017 |  | $ | (563 | ) |  | $ | 4,350 |  |  | $ | 3,787 |
Other comprehensive income |  |  | 697 |  |  |  | — |  |  |  | 697 |
Income taxes |  |  | — |  |  |  | — |  |  |  | — |
Balance at March 31, 2018 |  | $ | 134 |  |  | $ | 4,350 |  |  | $ | 4,484 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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