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Pension and Postretirement Plans (Total Benefit/Cost) (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 6,031 $ 5,602
Net Periodic Cost (Benefit) (44,782) (24,501)
Defined Benefit Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 6,031 5,602
Interest cost 7,670 6,654
Expected return on assets (41,963) (34,576)
Amortization of prior service cost (credit) 709 711
Recognized actuarial loss (gain) (17,229) (2,892)
Net Periodic Cost (Benefit) (44,782) (24,501)
Supplemental Executive Retirement Plan (SERP) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 228 255
Interest cost 822 736
Amortization of prior service cost (credit) 9 83
Recognized actuarial loss (gain) 166 1,482
Net Periodic Cost (Benefit) 1,225 2,556
Other Postretirement Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 24 36
Amortization of prior service cost (credit) (2) (2)
Recognized actuarial loss (gain) (711) (1,019)
Net Periodic Cost (Benefit) $ (689) $ (985)