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Partnership Distributions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Nov. 13, 2017
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 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)   $ 0.5110 $ 0.4883 $ 0.4665 $ 0.4457 $ 0.4108 $ 0.4333  
Incentive distribution   $ 819 $ 520 $ 223 $ 92 $ 0 $ 0  
General Partner                
Distribution Made to Limited Partner [Line Items]                
Incentive distribution $ 1,100