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Acquisition (Narrative) (Details)
$ in Thousands
9 Months Ended
Jul. 24, 2015
USD ($)
platform
mi
Jul. 23, 2015
USD ($)
Jul. 22, 2015
USD ($)
shares
Apr. 10, 2015
USD ($)
shares
Nov. 13, 2014
USD ($)
bbl
Sep. 30, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Business Acquisition [Line Items]              
Common units, issued | shares     10,350,000 4,600,000   109,979,218 95,029,218
Partners' Capital Account, Public Sale of Units Net of Offering Costs     $ 437,000 $ 198,000      
AROs arising from the Enterprise acquisition           $ 158,133  
Asset Retirement Obligation           177,308 $ 14,790
Long-term Debt, Fair Value           1,717,380 $ 1,003,600
Enterprise Offshore Acquisition              
Business Acquisition [Line Items]              
Business Combination, Acquisition Related Costs           $ 13,000  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 19 years            
Effective date of acquisition Jul. 24, 2015            
Business Acquisition, Transaction Costs $ 1,500,000            
Pipeline Length | mi 2,350            
Number of Hubs | platform 6            
American Phoenix Acquisition [Member]              
Business Acquisition [Line Items]              
Property, Plant and Equipment, Useful Life         30 years    
Effective date of acquisition         Nov. 13, 2014    
Business Acquisition, Transaction Costs         $ 157,000    
Business Acquisition, Cargo Capacity | bbl         330,000    
Cameron Highway Oil Pipeline Company [Member] | Enterprise Offshore Acquisition              
Business Acquisition [Line Items]              
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage 50.00%            
Poseidon Oil Pipeline Company [Member]              
Business Acquisition [Line Items]              
Equity Method Investment, Ownership Percentage           64.00%  
Poseidon Oil Pipeline Company [Member] | Enterprise Offshore Acquisition              
Business Acquisition [Line Items]              
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage 36.00%            
Sekco [Member] | Enterprise Offshore Acquisition              
Business Acquisition [Line Items]              
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage 50.00%            
Independence Hub, LLC [Member]              
Business Acquisition [Line Items]              
Noncontrolling Interest, Ownership Percentage by Parent           20.00%  
Equity Method Investment, Ownership Percentage           80.00%  
Six Point Seven Five Percentage Senior Unsecured Notes [Member]              
Business Acquisition [Line Items]              
Debt Instrument, Face Amount   $ 750,000       $ 750,000  
Debt Instrument, Interest Rate, Stated Percentage           6.75%  
Proceeds from Debt, Net of Issuance Costs   $ 728,600