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Partnership Distributions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Aug. 12, 2019
Jul. 25, 2019
Apr. 25, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2019
Equity [Abstract]                  
Partner Distribution Period                 45 days
Maximum eligibility of available cash                 50.00%
Incentive distribution rights threshold (in dollars per share)                 $ 0.4313
Distribution Made to Limited Partner [Line Items]                  
Distribution (in dollars per share)     $ 0.6132   $ 0.6132 $ 0.5858 $ 0.5110 $ 0.4883  
Distribution Made to Limited Partner, Cash Distributions Paid         $ 27,792 $ 25,613 $ 21,048 $ 19,851  
Incentive distribution         3,507 2,421 819 520  
Subsequent Event | General Partner                  
Distribution Made to Limited Partner [Line Items]                  
Incentive distribution $ 4,600                
Common Units                  
Distribution Made to Limited Partner [Line Items]                  
Distribution Made to Limited Partner, Cash Distributions Paid         14,534 13,876 12,103 11,566  
Common Units | Subsequent Event                  
Distribution Made to Limited Partner [Line Items]                  
Distribution (in dollars per share)   $ 0.6418              
Subordinated Units                  
Distribution Made to Limited Partner [Line Items]                  
Distribution Made to Limited Partner, Cash Distributions Paid         $ 9,751 $ 9,316 $ 8,126 $ 7,765  
Subordinated Units | Limited Partner                  
Distribution Made to Limited Partner [Line Items]                  
Partners' Capital Account, Units, Converted       15,902,584