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Other Assets
 12 Months Ended
Dec. 31, 2020
Other Assets, Noncurrent [Abstract]  
Other Assets Other Assets:
Other assets consist of the following at December 31, 2020 and 2019 (in thousands):
December 31,
20202019
Deferred income taxes(a)
$20,317 $15,275 
Assets related to unrecognized tax benefits(a)
24,112 26,127 
Operating leases(b)
136,292 133,864 
Other(c)
38,547 37,795 
Total$219,268 $213,061 

(a)See Note 1, “Summary of Significant Accounting Policies” and Note 21, “Income Taxes.”
(b)See Note 18, “Leases.”
(c)As of December 31, 2019, a $28.7 million reserve was recorded against a note receivable on one of our European entities no longer deemed probable of collection. This reserve and related receivable were written off as a result of the divestiture of our ownership interest in the SOCC joint venture. See Note 10, “Investments,” for additional information.