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Other Noncurrent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2021
Other Liabilities, Noncurrent [Abstract]  
Other Noncurrent Liabilities
Other noncurrent liabilities consist of the following at December 31, 2021 and 2020 (in thousands):
December 31,
20212020
Transition tax on foreign earnings(a)
$234,180 $273,048 
Operating leases(b)
126,997 116,765 
Liabilities related to uncertain tax positions(c)
27,719 14,683 
Executive deferred compensation plan obligation32,491 32,447 
Environmental liabilities(d)
37,540 36,298 
Asset retirement obligations(d)
76,196 74,856 
Tax indemnification liability(e)
66,799 30,488 
Other(f)
61,776 50,792 
Total$663,698 $629,377 
(a)Noncurrent portion of one-time transition tax on foreign earnings. See Note 21, “Income Taxes,” for additional information.
(b)See Note 18, “Leases.”
(c)See Note 21, “Income Taxes.”
(d)See Note 17, “Commitments and Contingencies.”
(e)Indemnification of certain income and non-income tax liabilities primarily associated with the Chemetall Surface Treatment entities sold in 2017.
(f)No individual component exceeds 5% of total liabilities.