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Partners' Capital Partners' Capital, Schedule of Common Units Issued Under ATM Program (Details) - USD ($)
$ in Thousands
6 Months Ended 22 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Limited Partners' Capital Account [Line Items]      
Public common units issued (units)   742,897  
Proceeds from common units issued, gross $ 5 $ 34,253  
Common units offering costs $ 0 $ 517  
General partner units issued (units) 120 15,602  
Proceeds from general partner units issued $ 5 $ 748  
Limited Partner [Member] | Common Unitholders Public [Member]      
Limited Partners' Capital Account [Line Items]      
Public common units issued (units)   742,897  
Proceeds from common units issued, gross 0 $ 33,505  
General Partner [Member]      
Limited Partners' Capital Account [Line Items]      
Proceeds from common units issued, gross $ 5 $ 748  
General partner units issued (units) 120 15,602  
Public Offering [Member]      
Limited Partners' Capital Account [Line Items]      
Proceeds from common units issued, gross     $ 45,500
Public Offering [Member] | Limited Partner [Member] | Common Unitholders Public [Member]      
Limited Partners' Capital Account [Line Items]      
Public common units issued (units)   742,897  
Proceeds from common units issued, gross   $ 35,728  
Common units offering costs   517  
Proceeds from common units issued, net   $ 35,211  
General Partner [Member] | General Partner [Member]      
Limited Partners' Capital Account [Line Items]      
General partner units issued (units)   15,602  
Proceeds from general partner units issued   $ 748