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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%

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