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Shareholders' equity (Tables)
12 Months Ended
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 TranslationPension BenefitDerivative InstrumentsTotal
(in thousands)
Balance at January 1, 2018$(10,054)$(2,442)$— $(12,496)
Other comprehensive gain/(loss), net of tax effect(12,911)757 — (12,154)
Balance at December 31, 2018(22,965)(1,685)— (24,650)
Other comprehensive gain/(loss), net of tax effect885 (1,064)— (179)
Balance at December 31, 2019(22,080)(2,749)— (24,829)
Other comprehensive gain/(loss), net of tax effect14,172 (161)390 14,401 
Balance at December 31, 2020$(7,908)$(2,910)$390 $(10,428)