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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 | Dec. 31, 2013 | Dec. 31, 2012
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Pinon Gathering Company LLC |  |
Variable Interest Entity [Line Items] |  |
Accounts receivable due from PGC | $ 741 | $ 1,976
Accounts payable due to PGC | $ 3,634 | $ 5,053

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