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Details of Certain Consolidated Balance Sheet Captions (Retirement Obligations and Other Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Details of Certain Consolidated Balance Sheet Captions [Abstract]
Pension and postretirement benefits	$ 202,583	$ 142,204
Deferred taxes	1,335	7,901
Operating lease liabilities	138,665	155,196
Legal and environmental	93,989	90,207
Uncertain tax positions and other tax liabilities	51,584	37,604
Other	39,629	31,613
Retirement obligations and other liabilities	$ 389,120	$ 309,529

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Details of Certain Consolidated Balance Sheet Captions [Abstract]

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For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various post employment and postretirement benefits provided to former or inactive employees, their beneficiaries, and covered dependents that is payable after one year (or beyond the operating cycle if longer. Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet due to materiality considerations. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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Amount recognized for uncertainty in income taxes classified as noncurrent.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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