Quarterly report pursuant to Section 13 or 15(d)

Leased Properties (Details)

v3.2.0.727
Leased Properties (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 29, 2015
USD ($)
Jun. 23, 2015
USD ($)
Dec. 31, 2012
Jun. 30, 2015
USD ($)
a
Point
tanks
bbl
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
a
Point
facility
tanks
mi
bbl
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 20, 2012
USD ($)
Oct. 31, 2012
Sale Leaseback Transaction [Line Items]                    
Net offering proceeds on Series A preferred stock $ 73,500,000 $ 73,500,000       $ 73,431,411 $ 45,624,563      
Long-term debt       $ 173,030,500   173,030,500   $ 63,532,000    
Pinedale Liquids Gathering System [Member]                    
Sale Leaseback Transaction [Line Items]                    
Deferred lease costs, net of accumulated amortization of $139,983 and $124,641       $ 699,000   $ 699,000   $ 727,000    
Length of transmission lines physical assets | mi           150        
Number of receipt points | Point       107   107        
Number of Above-ground Central Gathering Facilities | facility           4        
Estimated useful lives of assets           26 years        
Settlement date     Dec. 20, 2012              
Ownership percentage by noncontrolling owners     18.95%              
Non controlling economic interest pinedale GP     81.05%              
Depreciation expense       $ 2,200,000 $ 2,200,000 $ 4,300,000 4,300,000      
Eastern Interconnect Project [Member]                    
Sale Leaseback Transaction [Line Items]                    
Length of transmission lines physical assets | mi           216        
Estimated useful lives of assets           20 years        
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease       $ 0 570,000 $ 570,000 1,100,000      
Secured Debt [Member] | Key Bank [Member] | Pinedale Liquids Gathering System [Member]                    
Sale Leaseback Transaction [Line Items]                    
Long-term debt                 $ 70,000,000  
Portland Terminal Facility [Member]                    
Sale Leaseback Transaction [Line Items]                    
Crude oil and petroleum product storage capacity | bbl       1,500,000   1,500,000        
Estimated useful lives of assets           30 years        
Number of Acres Owned | a       39   39        
Number Of Tanks | tanks       84   84        
Depreciation expense       $ 422,000 $ 347,000 $ 829,000 $ 621,000      
Portland Terminal Facility [Member]                    
Sale Leaseback Transaction [Line Items]                    
Additional Expected Project Costs       8,800,000   8,800,000        
Construction and Development Costs           10,000,000        
Public Service Company of New Mexico [Member]                    
Sale Leaseback Transaction [Line Items]                    
Business Acquisition, Percentage of Voting Interests Acquired                   40.00%
Future Expectations [Member] | Public Service Company of New Mexico [Member]                    
Sale Leaseback Transaction [Line Items]                    
Fair Value of Lease Option Under Agreement       $ 7,700,000   $ 7,700,000