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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
Jun. 30, 2014
Dec. 31, 2013
Pinon Gathering Company LLC
   
Variable Interest Entity    
Accounts receivable due from PGC $ 1,672 $ 741
Accounts payable due to PGC $ 4,486 $ 3,634