Components of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period		$ 2,263,153	$ 1,526,133
Reclassifications from AOCI to earnings:
Balance, end of period		2,228,263	1,712,198
Pension and Other Postretirement Employee Benefits
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period		(28,494)	(51,369)
Unrecognized (losses) gains arising in AOCI during the period:
Gross		0	(6,157)
Tax effect		0	1,570
Reclassifications from AOCI to earnings:
Pension settlement	[1]	0	14,165
Other	[1]	(176)	2,033
Tax effect		45	(4,131)
Net of tax amount		(131)	7,480
Balance, end of period		(28,625)	(43,889)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period		126,146	8,131
Unrecognized (losses) gains arising in AOCI during the period:
Gross		(13,881)	43,492
Tax effect		290	(2,162)
Reclassifications from AOCI to earnings:
Gross	[2]	(3,837)	2,033
Tax effect		93	(87)
Net of tax amount		17,335	43,276
Balance, end of period		108,811	51,407
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period		97,652	(43,238)
Reclassifications from AOCI to earnings:
Balance, end of period		$ 80,186	$ 7,518

[1] Included in the computation of net periodic pension costs.

[2] Included in Interest expense, net on the Condensed Consolidated Statement of Operations.