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Equity - Cash Distributions (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 14, 2017
Oct. 25, 2017
Aug. 11, 2017
May 12, 2017
Feb. 14, 2017
Nov. 14, 2016
Aug. 12, 2016
May 31, 2016
Feb. 29, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Distribution Made to Limited Partner [Line Items]                          
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share)     $ 0.705 $ 0.690 $ 0.680 $ 0.655              
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share)     $ 2.82 $ 2.76 $ 2.72 $ 2.62              
Total Cash Distribution, including general partner interest and IDRs     $ 21,783 $ 21,024 $ 20,537 $ 19,302 $ 18,100 $ 17,100 $ 16,100        
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share)                   $ 0.715 $ 0.655 $ 2.110 $ 1.895
Subsequent Event [Member]                          
Distribution Made to Limited Partner [Line Items]                          
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share) $ 2.86                        
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share)   $ 0.715                      
Total Cash Distribution, including general partner interest and IDRs - Declared   $ 22,270