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Partnership Distributions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Feb. 12, 2018
Jan. 25, 2018
Nov. 13, 2017
Aug. 14, 2017
May 16, 2017
Feb. 14, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2017
Distribution Made to Limited Partner [Line Items]                  
Partner distribution period                 45 days
Maximum eligibility of available cash                 50.00%
Incentive distribution rights threshold ($ per unit)                 $ 0.4313
Distribution per Limited Partner Unit (in dollars per share)     $ 0.4665 $ 0.4457 $ 0.4108 $ 0.4333      
Cash distribution to holder of IDRs     $ 223 $ 92          
Common Units                  
Distribution Made to Limited Partner [Line Items]                  
Distribution per Limited Partner Unit (in dollars per share)             $ 0.0408 $ 0.3925  
Common Units | Subsequent Event                  
Distribution Made to Limited Partner [Line Items]                  
Distribution per Limited Partner Unit (in dollars per share)   $ 0.4883              
General Partner | Subsequent Event                  
Distribution Made to Limited Partner [Line Items]                  
Cash distribution to holder of IDRs $ 500