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Certain Provisions of the Partnership agreement (Textual) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Incentive Distribution Made to Managing Member or General Partner [Line Items]          
Approximate Date of Commencement of Proposed Sale to Public       May 29, 2014  
Percentage Of Avaliable Cash to Distribute 100.00%     100.00%  
Number Of Days From End Of Quarter For Distribution       45 days  
Distribution Made to Limited Partner, Distribution Date Nov. 13, 2014 Aug. 13, 2014 May 14, 2014    
Class B units conversion date       May 06, 2014  
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.370 $ 0.365 $ 0.36    
Common Unit, Issuance Value $ 75.0     $ 75.0  
Partners' Capital Account, Units, Sold in Public Offering       2,400,000  
Proceeds from Issuance of Common Limited Partners Units       71.9 0
Sales Commissions and Fees       0.7  
Class B units
         
Incentive Distribution Made to Managing Member or General Partner [Line Items]          
Distribution Made to Limited Partner, Distributions Declared, Per Unit     $ 0.10    
General Partner [Member] | Incentive Distribution Percentage, Level1 [Member]
         
Incentive Distribution Made to Managing Member or General Partner [Line Items]          
Incentive Distribution Percentage Levels       13.00%  
Incentive Distribution, Distribution Per Unit       $ 0.25  
General Partner [Member] | Incentive Distribution Percentage, Level2 [Member]
         
Incentive Distribution Made to Managing Member or General Partner [Line Items]          
Incentive Distribution Percentage Levels       23.00%  
Incentive Distribution, Distribution Per Unit       $ 0.3125  
General Partner [Member] | Incentive Distribution Percentage, Level3 [Member]
         
Incentive Distribution Made to Managing Member or General Partner [Line Items]          
Incentive Distribution Percentage Levels       48.00%  
Incentive Distribution, Distribution Per Unit       $ 0.375  
ATM [Member]
         
Incentive Distribution Made to Managing Member or General Partner [Line Items]          
Proceeds from Issuance of Common Limited Partners Units       $ 71.9