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Deferred Charges and Other Assets (Schedule Of Deferred Charges And Other Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred Charges and Other Assets [Line Items]    
Deposit on future leased plant and equipment $ 12,958 $ 12,958
Finance lease right-of-use assets 10,774 12,840
Deferred income tax assets 7,992 6,327
Asbestos insurance receivables 2,931 5,528
Deferred financing costs, net of amortization 2,106 1,507
Other 5,547 4,902
Deferred charges and other assets $ 42,308 $ 44,062
4.10% Senior Notes [Member]    
Deferred Charges and Other Assets [Line Items]    
Senior notes, interest rate 4.10% 4.10%