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Employee benefit plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Amounts recognized in the accumulated other comprehensive loss consist of: |  |  |
Net amount recognized | $ 6,302 | $ 5,197 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Liabilities | 1,485 | 561 |
Amounts recognized in the accumulated other comprehensive loss consist of: |  |  |
Net actuarial gain | (7,977) | (6,579) |
Deferred taxes | 1,675 | 1,382 |
Net amount recognized | (6,302) | (5,197) |
Accumulated benefit obligation | $ 19,113 | $ 17,491 | $ 16,338

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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=121641772&loc=SL7669686-108580 + Details
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