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
 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
May 31, 2012
Jun. 30, 2013
May 31, 2012
Nov. 30, 2012
Dec. 31, 2012
Pinedale Liquids Gathering System [Member]
Jun. 30, 2013
Pinedale Liquids Gathering System [Member]
mi
Point
Jun. 30, 2013
Pinedale Liquids Gathering System [Member]
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             107 107  
Estimated useful lives of assets             26 years    
Proceeds from non-controlling interest           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
Line of Credit Facility, Expiration Date Oct. 29, 2013                
Ownership percentage by noncontrolling owners           19.00%      
Non controlling economic interest pinedale GP           81.05%      
Depreciation expense $ 2,857,412 $ 246,828 $ 5,714,448 $ 493,633     $ 2,200,000 $ 4,400,000