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Employee benefit plans - Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Employee benefit plans |  |  |
Employer Service cost | $ 1,263 | $ 1,079 |
Interest cost | 84 | 71 |
Expected return on plan assets | (60) | (50) |
Amortization of prior service cost | 45 | 45 |
Amortization of actuarial losses | 66 | 66 |
Net periodic benefit cost | $ 1,398 | $ 1,211 |
Location of costs excluding the service component | us-gaap:OtherNonoperatingIncomeExpense | us-gaap:OtherNonoperatingIncomeExpense |
Expected contributions | $ 3,500 |  |
Accrued pension obligation | $ 15,800 |  | $ 15,700

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