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Variable Interest Entities - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Oct. 31, 2015 mi | Mar. 31, 2014
Variable Interest Entity [Line Items] |  |  |  |  |
Proceeds from the sale of royalty trust units | $ 0 | $ 22,119,000 | $ 28,985,000 |  |
Pinon Gathering Company LLC |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Number of miles of gathering lines acquired | mi |  |  |  | 370 |
Royalty Trusts |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of royalty interest conveyed to company at trust termination | 50.00% |  |  |  |
Percentage of royalty interest sold at trust termination | 50.00% |  |  |  |
Percentage of subordinated units to total units | 25.00% |  |  |  |
Percentage of cash available in excess of target distribution paid for incentive distribution | 50.00% |  |  |  |
Conversion ratio of Royalty Trust subordinated unit to common units | 1 |  |  |  |
Outstanding balance under loan commitment | $ 0 | 0 |  |  |
Noncontrolling interest in VIEs | 510,200,000 | 1,300,000,000 |  |  |
Proceeds from the sale of royalty trust units |  | 22,100,000 | $ 29,000,000 |  |
Total liabilities | $ 1,060,000 | $ 2,852,000 |  |  |
Grey Ranch Plant, L.P |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Beneficial interest owned by Company |  |  | 50.00% |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  | 50.00% |  |
Noncontrolling interest, decrease from redemptions percentage |  |  |  |  | 50.00%
Grey Ranch Plant Genpar, LLC (Genpar) |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Beneficial interest owned by Company |  |  | 50.00% |  |
Noncontrolling interest, decrease from redemptions percentage |  |  |  |  | 50.00%
Percentage ownership of another VIE |  |  | 1.00% |  |
Total liabilities |  |  | $ 0 |  |

X
- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Number Of Miles Of Gathering Lines Acquired + References No definition available. + Details
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X
- Definition Decrease in noncontrolling interest expressed as a percentage (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests). + References No definition available. + Details
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X
- Definition The percentage of the cash available for distribution on all trust units for any quarter in excess of the target distribution that is paid for the incentive distributions. + References No definition available. + Details
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- Definition Percentage of Royalty Interest to be sold at Trust terrmination with proceeds distributed to Royalty Trust unitholders + References No definition available. + Details
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- Definition The proceeds received from the sale of royalty trust units. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest). + References No definition available. + Details
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- Definition The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5710-111685 + Details
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