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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of components of accumulated other comprehensive income | The following shows the components of accumulated other comprehensive income or loss as of December 31, 2020 and 2019, respectively:
| Foreign Currency Translation |  | Pension Benefit |  | Derivative Instruments |  | Total
(in thousands) |  |  |
Balance at January 1, 2018 | $ | (10,054) |  |  | $ | (2,442) |  |  | $ | — |  |  | $ | (12,496) |
Other comprehensive gain/(loss), net of tax effect | (12,911) |  |  | 757 |  |  | — |  |  | (12,154) |
Balance at December 31, 2018 | (22,965) |  |  | (1,685) |  |  | — |  |  | (24,650) |
Other comprehensive gain/(loss), net of tax effect | 885 |  |  | (1,064) |  |  | — |  |  | (179) |
Balance at December 31, 2019 | (22,080) |  |  | (2,749) |  |  | — |  |  | (24,829) |
Other comprehensive gain/(loss), net of tax effect | 14,172 |  |  | (161) |  |  | 390 |  |  | 14,401 |
Balance at December 31, 2020 | $ | (7,908) |  |  | $ | (2,910) |  |  | $ | 390 |  |  | $ | (10,428) |

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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=118930883&loc=SL7669686-108580 + Details
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