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Pensions and Other Post-retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,579 $ 2,891 $ 7,738 $ 8,673
Interest cost 4,712 4,218 14,138 12,656
Expected return on plan assets (9,655) (9,097) (28,966) (27,289)
Amortization of prior service cost (credit) 54 (4) 162 (16)
Recognized net actuarial losses 2,555 3,454 7,666 10,360
Settlements 0 26 2,363 80
Net periodic benefit cost 245 1,488 3,101 4,464
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 88 92 266 276
Interest cost 249 199 747 595
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (101) (101) (303) (303)
Recognized net actuarial losses 217 188 651 564
Settlements 0 0 0 0
Net periodic benefit cost $ 453 $ 378 $ 1,361 $ 1,132