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Other Noncurrent Liabilities
 12 Months Ended
Dec. 31, 2020
Other Liabilities, Noncurrent [Abstract]  
Other Noncurrent Liabilities Other Noncurrent Liabilities:
Other noncurrent liabilities consist of the following at December 31, 2020 and 2019 (in thousands):
December 31,
20202019
Transition tax on foreign earnings(a)
$273,048 $303,490 
Wodgina Project acquisition consideration obligation(b)
— 120,800 
Operating leases(c)
116,765 114,686 
Liabilities related to uncertain tax positions(d)
14,683 21,169 
Executive deferred compensation plan obligation32,447 28,715 
Environmental liabilities(e)
36,298 33,058 
Asset retirement obligations(e)
74,856 55,848 
Tax indemnification liability(f)
30,488 30,993 
Other(g)
50,792 45,777 
Total$629,377 $754,536 
(a)Noncurrent portion of one-time transition tax on foreign earnings. See Note 21, “Income Taxes,” for additional information.
(b)Represents the 40% interest in the Kemerton assets, which are under construction, expected to be transferred to MRL as part of the consideration paid for the Wodgina Project acquisition. See Note 2, “Acquisitions,” for further details.
(c)See Note 18, “Leases.”
(d)See Note 21, “Income Taxes.”
(e)See Note 17, “Commitments and Contingencies.”
(f)Indemnification of certain income and non-income tax liabilities associated with the Chemetall Surface Treatment entities sold in 2017.
(g)No individual component exceeds 5% of total liabilities.