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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net loss (gain) $ 6,946 $ 7,863  
Pension Benefits      
Net periodic pension cost:      
Interest cost 665 696 $ 678
Expected return on plan assets (893) (931) (910)
Amortization of unrecognized net loss 209 198 92
Net periodic pension cost (19) (37) (140)
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net loss (gain) 917 296 3,684
Deferred tax (321) (104) (1,289)
Total recognized in other comprehensive income 596 192 2,395
Total recognized in net period pension cost and other comprehensive income $ 577 $ 155 $ 2,255