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Components of net benefit costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Pension settlement charges $ 41,406 $ 0 $ 120
Other Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Service Cost 6,953 7,587 7,473
Defined Benefit Plan, Interest Cost 9,554 9,949 10,820
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (14,231) (13,760) (13,654)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (123) (274) (460)
Defined Benefit Plan Recognized Actuarial Net Gains Losses 7,171 6,636 6,005
DefinedBenefitPlanNetPeriodicBenefitCostBeforeSettlements 9,324 10,138 10,184
Pension settlement charges 41,406 0 120
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 50,730 10,138 10,304
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Service Cost 111 91 105
Defined Benefit Plan, Interest Cost 396 398 562
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0 0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (1,497) (1,497) (1,497)
Defined Benefit Plan Recognized Actuarial Net Gains Losses 0 0 0
DefinedBenefitPlanNetPeriodicBenefitCostBeforeSettlements (990) (1,008) (830)
Pension settlement charges 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (990) $ (1,008) $ (830)