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Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accounting Policies [Abstract] |  |  |
Drilling and Related Costs Capitalized | $ 12,900 | $ 6,000 |
Write-downs | 4,446 | 313,337 | $ 1,472,721
Restricted Cash and Cash Equivalents | $ 17,600 | $ 11,600 |

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