Net Income Per Limited Partner Unit (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended
Apr. 29, 2015
Mar. 31, 2015
Subsequent Event [Member]    
Schedule Of Earnings Per Unit [Line Items]    
Distribution Made to Limited Partner, Cash Distributions Declared $ 9.2  
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.0912  
Distribution Made to Limited Partner, Distribution Date May 20, 2015  
Distribution Made to Limited Partner, Date of Record May 13, 2015  
Minimum    
Schedule Of Earnings Per Unit [Line Items]    
Distribution Made to Limited Partner, Distributions Paid, Per Unit   $ 0.1675
Minimum | Annualized    
Schedule Of Earnings Per Unit [Line Items]    
Distribution Made to Limited Partner, Distributions Paid, Per Unit   $ 0.67