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Employee benefit plans - Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Employee benefit plans |  |  |
Employer Service cost | $ 1,457 | $ 1,263 |
Interest cost | 46 | 84 |
Expected return on plan assets | (30) | (60) |
Amortization of prior service cost | 54 | 45 |
Amortization of actuarial losses | 167 | 66 |
Net periodic benefit cost | $ 1,694 | $ 1,398 |
Location of costs excluding the service component | us-gaap:OtherNonoperatingIncomeExpense | us-gaap:OtherNonoperatingIncomeExpense |
Expected contributions | $ 4,000 |  |
Accrued pension obligation | $ 24,600 |  | $ 24,100

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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