Pension and Other Post-Retirement Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	6,011	5,597	12,022	11,194
Expected return on plan assets	(11,738)	(11,875)	(23,476)	(23,750)
Amortization of net (gain) loss	313	1,764	626	3,528
Net periodic benefit cost (income)	5,414	4,514	10,828	9,028
Post-Retirement Healthcare Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	19	24	38	48
Interest cost	15	10	30	20
Expected return on plan assets	0	0	0	0
Amortization of net (gain) loss	11	47	22	94
Net periodic benefit cost (income)	$ (45)	$ (81)	$ (90)	$ (162)