Pension and Other Post-Retirement Benefit Plans (Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 30,867	$ 3,447
Change in benefit obligation [Roll Forward]
Obligation, beginning balance	873,826	779,031
Service cost	0	0	$ 0
Interest cost	22,387	27,880	31,299
Plan transfers	3,125	2,895
Defined Benefit Plan, Benefit Obligation, Benefits Paid	36,109	34,218
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	0	(2,435)
Actuarial (gain) loss	(23,962)	100,673
Obligation, ending balance	839,267	873,826	779,031
Change in plan assets [Roll Forward]
Plan assets, beginning balance	843,895	746,763
Actual gain on plan assets	37,626	120,057
Employer contributions	1,658	10,833
Plan assets, ending balance	850,195	843,895	746,763
Funded status
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	0	2,435
Post-Retirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	0	0
Change in benefit obligation [Roll Forward]
Obligation, beginning balance	3,484	3,707
Service cost	95	139	107
Interest cost	42	91	148
Plan transfers	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	250	362
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	0	0
Actuarial (gain) loss	(229)	(74)
Obligation, ending balance	3,142	3,484	3,707
Change in plan assets [Roll Forward]
Plan assets, beginning balance	0	0
Actual gain on plan assets	0	0
Employer contributions	250	362
Plan assets, ending balance	0	0	$ 0
Funded status
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	0	(17)
Other Current Liabilities [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(1,345)	(1,348)
Other Current Liabilities [Member] | Post-Retirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(399)	(415)
Other Noncurrent Liabilities [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(18,594)	(32,030)
Other Noncurrent Liabilities [Member] | Post-Retirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ (2,743)	$ (3,069)