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Partnership Distributions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Nov. 12, 2018
Oct. 25, 2018
Sep. 30, 2016
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Equity [Abstract]                      
Partner Distribution Period                     45 days
Maximum eligibility of available cash                     50.00%
Incentive distribution rights threshold ($ per unit)                     $ 0.4313
Distribution Made to Limited Partner [Line Items]                      
Distribution ($ per unit)       $ 0.5348 $ 0.5110 $ 0.4883 $ 0.4665 $ 0.4457 $ 0.4108 $ 0.4333  
Incentive distribution       $ 1,134 $ 819 $ 520 $ 223 $ 92 $ 0 $ 0  
Subsequent Event | General Partner                      
Distribution Made to Limited Partner [Line Items]                      
Incentive distribution $ 1,500                    
Common Units                      
Distribution Made to Limited Partner [Line Items]                      
Distribution ($ per unit)     $ 0.0408             $ 0.3925  
Common Units | Subsequent Event                      
Distribution Made to Limited Partner [Line Items]                      
Distribution ($ per unit)   $ 0.5597