Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost, net	$ 5,148	$ 5,232	$ 15,745	$ 15,832
Interest cost on projected benefit obligations	2,124	1,391	6,528	4,201
Expected return on plan assets	(10,499)	(10,345)	(32,040)	(31,208)
Recognition of prior service cost	(1,065)	(480)	(3,243)	(1,454)
Recognition of actuarial losses/(gains)	5,241	6,929	16,034	20,914
Net periodic pension cost/(credit)	949	2,727	3,024	8,285
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost, net	416	374	1,248	1,122
Interest cost on projected benefit obligations	674	546	2,022	1,644
Expected return on plan assets	(1,548)	(1,494)	(4,642)	(4,482)
Recognition of prior service cost	0	0	0	0
Recognition of actuarial losses/(gains)	584	728	1,753	2,186
Net periodic pension cost/(credit)	126	154	381	470
Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost, net	4,732	4,858	14,497	14,710
Interest cost on projected benefit obligations	1,447	843	4,497	2,551
Expected return on plan assets	(8,951)	(8,851)	(27,398)	(26,726)
Recognition of prior service cost	(1,046)	(462)	(3,187)	(1,398)
Recognition of actuarial losses/(gains)	4,665	6,211	14,304	18,756
Net periodic pension cost/(credit)	847	2,599	2,713	7,893
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year, Description	28,200		28,200
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost, net	0	0	0	0
Interest cost on projected benefit obligations	3	2	9	6
Expected return on plan assets	0	0	0	0
Recognition of prior service cost	(19)	(18)	(56)	(56)
Recognition of actuarial losses/(gains)	(8)	(10)	(23)	(28)
Net periodic pension cost/(credit)	$ (24)	$ (26)	$ (70)	$ (78)