Net Income Per Limited Partner Unit (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jan. 29, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
[1]
Dec. 31, 2015
Schedule Of Earnings Per Unit [Line Items]            
Distribution Made to Limited Partner, Distributions Declared, Per Unit   $ 0.1800 $ 0.1725 $ 0.1675 $ 0.0912  
Distribution Made to Limited Partner, Distribution Date   Feb. 19, 2016 Nov. 20, 2015 Aug. 20, 2015 May 20, 2015  
Distribution Made to Limited Partner, Date of Record   Feb. 11, 2016 Nov. 13, 2015 Aug. 13, 2015 May 13, 2015  
Minimum            
Schedule Of Earnings Per Unit [Line Items]            
Distribution Made to Limited Partner, Distributions Paid, Per Unit           $ 0.1675
Annualized [Member] | Minimum            
Schedule Of Earnings Per Unit [Line Items]            
Distribution Made to Limited Partner, Distributions Paid, Per Unit           $ 0.67
Subsequent Event            
Schedule Of Earnings Per Unit [Line Items]            
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.1800          
Distribution Made to Limited Partner, Cash Distributions Declared $ 18.1          
Distribution Made to Limited Partner, Distribution Date Feb. 19, 2016          
Distribution Made to Limited Partner, Date of Record Feb. 11, 2016          
[1] The quarterly distribution for three months ended March 31, 2015 was prorated for the period beginning immediately after the closing of the IPO, February 11, 2015 through March 31, 2015.