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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders Equity Note [Abstract] |
Components of Changes in Accumulated Other Comprehensive Income (Loss) | The components of and changes in accumulated other comprehensive income (loss) are as follows:
(U.S. Dollars, in thousands) |  | Currency Translation Adjustments |  |  | Derivatives |  |  | Debt Security |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at December 31, 2015 |  | $ | (4,389 | ) |  | $ | 228 |  |  | $ | (2,071 | ) |  | $ | (6,232 | )
Other comprehensive loss |  |  | (726 | ) |  |  | (360 | ) |  |  | (1,744 | ) |  |  | (2,830 | )
Income taxes |  |  | — |  |  |  | 132 |  |  |  | 659 |  |  |  | 791 |
Reclassification adjustments to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense, net |  |  | — |  |  |  | — |  |  |  | 2,727 |  |  |  | 2,727 |
Income taxes |  |  | — |  |  |  | — |  |  |  | (1,036 | ) |  |  | (1,036 | )
Balance at December 31, 2016 |  | $ | (5,115 | ) |  | $ | — |  |  | $ | (1,465 | ) |  | $ | (6,580 | )
Other comprehensive income |  |  | 4,552 |  |  |  | — |  |  |  | 3,830 |  |  |  | 8,382 |
Income taxes |  |  | — |  |  |  | — |  |  |  | (1,475 | ) |  |  | (1,475 | )
Reclassification adjustments to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense, net |  |  | — |  |  |  | — |  |  |  | 5,585 |  |  |  | 5,585 |
Income taxes |  |  | — |  |  |  | — |  |  |  | (2,125 | ) |  |  | (2,125 | )
Balance at December 31, 2017 |  | $ | (563 | ) |  | $ | — |  |  | $ | 4,350 |  |  | $ | 3,787 |

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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=66004124&loc=SL7669686-108580 + Details
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