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Income Taxes (Summary Of Differences Between The Financial Statement And Tax Bases Of Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Tax Assets: |  |
Basis difference in fixed assets | $ 27,995 | $ 26,590
Foreign tax credit carryforward | 34,144 | 34,144
Alternative minimum tax credit carryover |  | 337
U.S. federal net operating losses | 32,579 | 30,572
Foreign net operating losses | 24,602 | 11,770
Asset retirement obligations | 3,640 | 3,407
Operating leases | 1,472 |
Basis difference in accrued liabilities | 368 | 676
Basis difference in receivables | 331 | 171
Other | 1,121 | 1,120
Total deferred tax assets | 126,252 | 108,787
Valuation allowance | $ (126,252) | (84,628)
Net deferred tax assets |  | $ 24,159

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