Quarterly report pursuant to Section 13 or 15(d)

Leases (Details)

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Leases (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Pinedale Liquids Gathering System [Member]          
Operating Leased Assets [Line Items]          
Percentage of total leased properties 40.26%   40.26%   79.17%
Percentage of leased property revenue 75.90% 71.85% 73.02% 73.42%  
Grand Isle Gathering System [Member]          
Operating Leased Assets [Line Items]          
Percentage of total leased properties 50.10%   50.10%   0.00%
Percentage of leased property revenue 0.00% 0.00% 0.00% 0.00%  
Portland Terminal Facility [Member]          
Operating Leased Assets [Line Items]          
Percentage of total leased properties 9.37%   9.37%   17.24%
Percentage of leased property revenue 23.82% 19.12% 22.19% 17.35%  
Public Service Company of New Mexico [Member]          
Operating Leased Assets [Line Items]          
Percentage of total leased properties 0.00%   0.00%   3.07%
Percentage of leased property revenue 0.00% 9.03% 4.52% 9.23%