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Acquisitions (Details) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jul. 12, 2012
Jun. 30, 2012
UNEV Pipeline [Member]
Nov. 09, 2011
Legacy Frontier [Member]
Nov. 09, 2011
Promissory Notes [Member]
Legacy Frontier [Member]
Jun. 30, 2012
UNEV Pipeline [Member]
Jun. 30, 2012
UNEV Pipeline [Member]
Jul. 12, 2012
UNEV Pipeline [Member]
Consecutive_Quarters
Jun. 30, 2012
HFC [Member]
UNEV Pipeline [Member]
Business Acquisition [Line Items]                        
Equity Method Investment, Ownership Percentage                 75.00% 75.00%    
Business Acquisition, cash paid                   $ 260,000,000    
Promissory notes issued               150,000,000        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares             3,807,615   1,029,900      
Ownership percentage, controlling interest 42.00%   42.00%   44.00%              
General partner interest     2.00%                  
Business Acquisition, minimum annual revenue commitments           15,600,000           23,000,000
Business Acquisition, allocation to properties and equipment             88,100,000       426,000,000  
Business Acquisition, Purchase Price Allocation, Liabilities Assumed                     6,000,000  
Business Acquisition, allocation to goodwill             207,400,000          
Business Acquisition, Pro Forma Information                        
Revenues 67,706,400 62,653,000 135,283,100 119,560,000                
Net income   26,964,000   50,278,000                
Limited partners interest in net income 20,537,000   40,000,000                  
Business Acquisition, Pro Forma Earnings Per Outstanding Limited Partnership Unit, Basic and Diluted   $ 0.86   $ 1.60                
Business Combinations, Cap on share of future earnings                 34,000,000      
Business Acquisition, Post Acquisition Incentive Distributions                 1,250,000      
Number of Consecutive Quarters, Forego Rights to Incentive Distributions                     12  
Number Of Consecutive Quarters, Forego Rights To Incentive Distributions, Extension                     4  
Business Acquisitions, Acquiree Equity                     420,000,000  
Business Acquisition, Acquiree Equity, Non Controlling Interest Portion                     $ 100,000,000