Quarterly report pursuant to Section 13 or 15(d)

Leased Properties (Details)

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Leased Properties (Details) (USD $)
Share data in Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2012
Mar. 31, 2013
Feb. 29, 2012
Nov. 30, 2012
Dec. 31, 2012
Pinedale Liquids Gathering System [Member]
Mar. 31, 2013
Pinedale Liquids Gathering System [Member]
mi
Point
Dec. 20, 2012
Secured Debt [Member]
Key Bank [Member]
Pinedale Liquids Gathering System [Member]
Sale Leaseback Transaction [Line Items]              
Cash paid for acquisition         $ 205,000,000    
Fair value of investements acquired         23,000,000    
Shares issued with acquisition         13    
Shares issued with acquisition, value         73,600,000    
Length of transmission lines physical assets           150  
Number of receipt points           107  
Estimated useful lives of assets           26 years  
Proceeds from non-controlling interest 30,000,000 0 0   30,000,000    
Proceeds from contributions from parent         108,300,000    
Settlement date         Dec. 20, 2012    
Long-term debt 70,000,000 70,000,000   0     70,000,000
Ownership percentage by noncontrolling owners         1895.00%    
Non controlling economic interest pinedale GP         81.05%    
Depreciation expense $ 499,357 $ 2,857,036 $ 246,805   $ 286,000 $ 2,200,000