Quarterly report pursuant to Section 13 or 15(d)

Leases Leases (Details)

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Leases Leases (Details)
1 Months Ended 3 Months Ended
Dec. 31, 2012
Mar. 31, 2013
Pinedale Liquids Gathering System [Member]
   
Operating Leased Assets [Line Items]    
Percentage of total leased properties 94.20% 94.20%
Percentage of leased property revenue 75.20% 88.70%
Public Service Copmany of New Mexico [Member]
   
Operating Leased Assets [Line Items]    
Percentage of total leased properties 5.80% 5.80%
Percentage of leased property revenue 24.80% 11.30%