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Divestiture (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 21, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |  |
Cash paid on settlement of contract |  |  |  | $ 11,000 | $ 0
Loss on settlement of contract |  | $ 0 | $ 0 | 90,184 | $ 0
Disposed of by Means Other Than Sales | WTO Properties |  |  |  |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |  |
Cash paid on settlement of contract | $ 11,000 |  |  |  |
Treating Agreement | WTO Properties |  |  |  |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |  |
Reduction in asset retirement obligations |  |  |  | 34,100 |
Treating Agreement | Disposed of by Means Other Than Sales | WTO Properties |  |  |  |  |
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract] |  |  |  |  |
Contract agreement, term | 30 years |  |  |  |
Cumulative shortfall accrued | $ 111,900 |  |  |  |
Loss on settlement of contract |  |  |  | $ 89,100 |

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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 35 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846 + Details
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