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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 | Sep. 30, 2013 | Dec. 31, 2012
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Pinon Gathering Company LLC |  |
Variable Interest Entity |  |
Accounts receivable due from PGC | $ 1,496 | $ 1,976
Accounts payable due to PGC | $ 4,249 | $ 5,053

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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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