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Employee benefit plans - Components of Net Periodic Pension Expense (Income) and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net loss (gain) $ 7,218 $ 6,628  
Pension Benefits      
Net periodic pension cost:      
Interest cost 623 650 $ 665
Expected return on plan assets (960) (915) (893)
Amortization of unrecognized net gain 194 195 209
Net periodic pension cost (143) (70) (19)
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net loss (gain) (590) 318 917
Deferred tax 124 (67) (321)
Total recognized in other comprehensive loss (466) 251 596
Total recognized in net period pension cost and other comprehensive loss (609) $ 181 $ 577
Estimated net loss for defined benefit pension plan that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over next fiscal year $ 223