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Variable Interest Entities - PGC - Amounts due to/from the Company (Details) (Pinon Gathering Company LLC, USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Pinon Gathering Company LLC
Variable Interest Entity
Accounts receivable due from PGC	$ 1,050	$ 741
Accounts payable due to PGC	$ 3,827	$ 3,634

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- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

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- Definition

Carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685

+ Details

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Balance Type:	credit
Period Type:	instant