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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Deferred Tax Assets: |  |  |
Basis difference in fixed assets | $ 46,929 | $ 89,016 |
Foreign tax credit carryforward | 48,071 | 50,339 |
Alternative minimum tax credit carryover | 1,349 | 1,349 |
U.S. federal net operating losses | 22,490 | 30,230 |
Foreign net operating losses | 26,371 | 25,543 |
Asset retirement obligations | 4,234 | 6,514 |
Basis difference in receivables | 1,331 | 1,824 |
Other | 3,690 | 6,952 |
Total deferred tax assets | 154,465 | 211,767 |
Valuation allowance | (153,205) | $ (211,767) | $ (210,700)
Net deferred tax assets | $ 1,260 |  |

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