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Acquisitions and Divestitures - Acquisitions (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) a well | Oct. 31, 2015 USD ($) mi | Dec. 31, 2015 USD ($) a well | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Aug. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Payments to acquire oil and gas property and equipment |  |  | $ 216,943,000 | $ 18,384,000 | $ 17,028,000 |
Fair value of assets acquired |  |  | 701,615,000 | 1,608,889,000 | 1,423,883,000 |
Loss on termination of the gathering contract |  |  | $ 50,976,000 | $ 0 | $ 0 |
Pinon Gathering Company LLC |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Payments to acquire oil and gas property and equipment |  | $ 48,000,000 |  |  |  |
Principal amount of debt issued related to acquisition |  | $ 78,000,000.0 |  |  |  |
Number of miles of gathering lines acquired | mi |  | 370 |  |  |  |
Fair value of consideration paid for acquisition |  | $ 98,300,000 |  |  |  |
Loss on termination of the gathering contract |  | 51,000,000 |  |  |  |
Rockies Properties | North Park Basin, Jackson County, Colorado |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Payments to acquire oil and gas property and equipment | $ 191,100,000 |  |  |  |  |
Number acres acquired | a | 135,000 |  | 135,000 |  |  |
Proceeds from sale of oil and natural gas properties | $ 3,100,000 |  |  |  |  |
Number of wells acquired | well | 16 |  | 16 |  |  |
Oil and Gas Properties | Pinon Gathering Company LLC |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Fair value of assets acquired |  | $ 47,300,000 |  |  |  |
Senior Notes | 8.75% Senior Notes due 2020 |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Long-term debt, fixed interest rate | 8.75% | 8.75% | 8.75% | 8.75% |  | 8.75%

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- Definition The notes issued to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.The notes issued to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale. + References No definition available. + Details
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