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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Deferred Tax Assets: |  |  |
Basis difference in fixed assets | $ 89,016 | $ 98,890 |
Foreign tax credit carryforward | 50,339 | 58,290 |
Alternative minimum tax credit carryover | 1,349 | 1,349 |
U.S. federal net operating losses | 30,230 | 13,878 |
Foreign net operating losses | 25,543 | 29,182 |
Asset retirement obligations | 6,514 | 5,658 |
Basis difference in receivables | 1,824 | 4,148 |
Other | 6,952 | (648) |
Total deferred tax assets | 211,767 | 210,747 |
Valuation allowance | (211,767) | (210,747) | $ (147,700)
Total deferred tax asset |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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