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Partners' Equity, 2011 Issuances (Details) (USD $)
12 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
Dec. 31, 2012
UNEV Pipeline [Member]
Jun. 30, 2012
UNEV Pipeline [Member]
Nov. 09, 2011
Legacy Frontier [Member]
Schedule of Equity Method Investments [Line Items]              
General Partners' Contributed Capital $ 1,700,000 $ 5,900,000          
Stock Issued During Period, Shares, New Issues   2,950,000          
Common Units Issued - Price per Share   $ 26.75          
Public Offering of Securities, Maximum Proceeds Authorized 2,000,000,000            
Proceeds from Issuance of Common Limited Partners Units $ 0 $ 75,815,000 [1] $ 0 [1]        
Partners' capital account, units held by controlling interest 24,255,030            
General partner ownership interest 2.00%            
Ownership percentage, controlling interest 44.00%     42.00%      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares         2,059,800   7,615,230
Equity method investment, ownership percentage         75.00% 75.00%  
[1] (1) Restated as described in Note 2.