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Pensions and Other Post-retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2,423 $ 2,891
Interest cost 4,705 4,219
Expected return on plan assets (9,653) (9,096)
Amortization of prior service credit (4) (6)
Recognized net actuarial losses 2,577 3,453
Settlement/curtailment loss (credit) 0 27
Net periodic benefit cost 48 1,488
Other Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 89 101
Interest cost 249 221
Expected return on plan assets 0 0
Amortization of prior service credit (101) (77)
Recognized net actuarial losses 217 25
Settlement/curtailment loss (credit) 0 (141)
Net periodic benefit cost $ 454 $ 129