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Accumulated other comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Components of Changes in Accumulated Other Comprehensive Income (Loss) | The components of and changes in accumulated other comprehensive income were as follows:
(U.S. Dollars, in thousands) |  | Currency Translation Adjustments |  |  | Debt Security |  |  | Accumulated Other Comprehensive Income |
Balance at December 31, 2017 |  | $ | (563 | ) |  | $ | 4,350 |  |  | $ | 3,787 |
Other comprehensive income |  |  | (478 | ) |  |  | 1,960 |  |  |  | 1,482 |
Income taxes |  |  | — |  |  |  | (432 | ) |  |  | (432 | )
Balance at June 30, 2018 |  | $ | (1,041 | ) |  | $ | 5,878 |  |  | $ | 4,837 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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