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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, 2021 | Dec. 31, 2020
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Deferred Tax Assets: |  |
Basis difference in fixed assets | $ 20,133 | $ 27,995
Foreign tax credit carryforward | 20,084 | 34,144
U.S. federal net operating losses | 25,182 | 32,579
Foreign net operating losses | 8,693 | 24,602
Asset retirement obligations | 8,546 | 3,640
Operating leases | 1,750 | 1,472
Basis difference in accrued liabilities | 402 | 368
Basis difference in receivables | 454 | 331
Other | 1,683 | 1,121
Total deferred tax assets | 86,927 | 126,252
Valuation allowance | (46,949) | $ (126,252)
Net deferred tax assets | $ 39,978 |

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