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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Deferred Tax Assets: |  |  |
Basis difference in fixed assets | $ 38,479 | $ 46,929 |
Foreign tax credit carryforward | 43,760 | 48,071 |
Alternative minimum tax credit carryover | 674 | 1,349 |
U.S. federal net operating losses | 20,616 | 22,490 |
Foreign net operating losses | 19,989 | 26,371 |
Asset retirement obligations | 3,111 | 4,234 |
Basis difference in accrued liabilities | 3,816 | 3,716 |
Basis difference in receivables | 387 | 1,331 |
Other | 180 |  |
Other |  | (26) |
Total deferred tax assets | 131,012 | 154,465 |
Valuation allowance | (90,935) | (153,205) | $ (211,800)
Net deferred tax assets | $ 40,077 | $ 1,260 |

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