Quarterly report pursuant to Section 13 or 15(d)

Debt - Pinedale Credit Facility (Details)

v3.8.0.1
Debt - Pinedale Credit Facility (Details)
 3 Months Ended
Mar. 30, 2016
USD ($)
Instrument
Dec. 20, 2012
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]          
Principal balance       $ 17,534,177 $ 89,387,985
Total assets       647,939,143 $ 650,732,571
Pinedale Liquids Gathering System [Member]          
Line of Credit Facility [Line Items]          
Total assets       $ 145,000,000  
Secured Debt [Member] | Pinedale LP [Member] | Secured Term Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity   $ 70,000,000      
Basis spread on variable rate 1.00%        
Extension period   1 year      
Principal payment through extension period     $ 3,200,000    
Principal balance $ 58,500,000        
Secured Debt [Member] | LIBOR [Member] | Pinedale LP [Member] | Secured Term Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate   3.25% 4.25%    
General Partner [Member] | Pinedale Liquids Gathering System [Member] | Pinedale GP [Member]          
Line of Credit Facility [Line Items]          
Controlling economic interest       81.05%  
Value of controlling economic interest $ 47,400,000        
Maximum [Member] | Secured Debt [Member] | LIBOR [Member] | Pinedale LP [Member] | Secured Term Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 7.00%        
Cash Flow Hedging [Member]          
Line of Credit Facility [Line Items]          
Number of instruments terminated | Instrument 1        
Interest Rate Swap [Member] | Cash Flow Hedging [Member]          
Line of Credit Facility [Line Items]          
Number of instruments terminated | Instrument 1        
Cash flow hedge terminated $ 26,300,000