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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
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net $ 4,054 $ 4,025 $ 12,087 $ 12,233
Interest cost on projected benefit obligations 3,709 3,256 11,081 9,764
Expected return on plan assets (8,814) (9,466) (26,261) (28,605)
Recognition of prior service cost (1,679) (1,820) (5,033) (5,527)
Recognition of actuarial losses/(gains) 5,569 6,471 16,672 19,677
Net periodic pension cost/(credit) 2,839 2,466 8,546 7,542
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 266 273 797 817
Interest cost on projected benefit obligations 1,146 1,060 3,438 3,182
Expected return on plan assets (1,472) (1,733) (4,415) (5,197)
Recognition of prior service cost 0 0 0 0
Recognition of actuarial losses/(gains) 593 1,451 1,780 4,353
Net periodic pension cost/(credit) 533 1,051 1,600 3,155
Other Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 3,788 3,752 11,290 11,416
Interest cost on projected benefit obligations 2,547 2,180 7,595 6,534
Expected return on plan assets (7,342) (7,733) (21,846) (23,408)
Recognition of prior service cost (1,679) (1,727) (5,033) (5,248)
Recognition of actuarial losses/(gains) 5,149 5,331 15,410 16,261
Net periodic pension cost/(credit) 2,463 1,803 7,416 5,555
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year, Description 25,300   25,300  
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 0 0 0 0
Interest cost on projected benefit obligations 16 16 48 48
Expected return on plan assets 0 0 0 0
Recognition of prior service cost 0 (93) 0 (279)
Recognition of actuarial losses/(gains) (173) (311) (518) (937)
Net periodic pension cost/(credit) $ (157) $ (388) $ (470) $ (1,168)