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Oil And Gas Properties (Major Classes Of Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 2 |  | $ 2 |  | $ 1
Current assets of discontinued operations | 84,000 |  | 118,921 |  |
Non-current assets of discontinued operations | 816,227 |  | 905,399 |  |
Current asset retirement obligations | 2,898 | [1] | 27,300 | [1] |
Current liabilities of discontinued operations | 182,527 |  | 166,975 |  |
Non-current liabilities of discontinued operations | 147,237 |  | 161,208 |  |
Energy Resource Technology GOM, Inc [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash and cash equivalents | 2 |  | 2 |  |
Accounts receivable | 63,762 |  | 90,882 |  |
Other current assets | 20,236 |  | 28,037 |  |
Current assets of discontinued operations | 84,000 |  | 118,921 |  |
Property and equipment, net | 787,852 |  | 871,658 |  |
Other assets, net | 28,375 |  | 33,741 |  |
Non-current assets of discontinued operations | 816,227 |  | 905,399 |  |
Accounts payable | 110,569 |  | 73,124 |  |
Accrued liabilities | 18,217 |  | 27,968 |  |
Current asset retirement obligations | 53,741 |  | 65,883 |  |
Current liabilities of discontinued operations | 182,527 |  | 166,975 |  |
Asset retirement obligations | 147,237 |  | 161,208 |  |
Non-current liabilities of discontinued operations | $ 147,237 |  | $ 161,208 |  |
[1] | Reflects the substantial completion of the abandonment of the Camelot field (Note 3).

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