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Equity - Cash Distributions (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
May 15, 2018
Feb. 12, 2018
Nov. 14, 2017
Aug. 11, 2017
May 12, 2017
Feb. 28, 2017
Mar. 31, 2018
Mar. 31, 2017
Distribution Made to Limited Partner [Line Items]                
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share)   $ 0.725 $ 0.715 $ 0.705 $ 0.69      
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share)   $ 2.90 $ 2.86 $ 2.82 $ 2.76      
Total Cash Distribution, including general partner interest and IDRs   $ 22,777 $ 22,270 $ 21,783 $ 21,024 $ 20,500    
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share)             $ 0.75 $ 0.69
Subsequent Event                
Distribution Made to Limited Partner [Line Items]                
Total Cash Distribution, including general partner interest and IDRs $ 23,997              
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share) $ 0.75              
Distribution Made To Limited Partner Distributions Declared Annualized Per Unit $ 3.00