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Cash Distributions and Earnings per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Distribution Made To Limited Partner [Line Items]      
Description of the distribution amount per unit for all classes of units The first 98% of the quarterly distribution is paid to all common units holders. The incentive distributions rights (held by the General Partner) apply only after a minimum quarterly distribution of $0.4025.    
Description of loss allocation Net loss per unit undistributed is determined by taking the distributions in excess of net income and allocating between common units and general partner units on a 98%-2% basis.    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,353,335 0  
Common and subordinated units      
Distribution Made To Limited Partner [Line Items]      
Net loss allocated to each class of unit 98.00%    
General Partner Units      
Distribution Made To Limited Partner [Line Items]      
Net loss allocated to each class of unit 2.00%    
Installment 4 - FY 2014      
Distribution Made To Limited Partner [Line Items]      
Declaration date Jan. 26, 2015    
Cash distribution declared per unit     $ 0.4425
Distribution date Feb. 13, 2015    
Date of record Feb. 11, 2015    
Aggregate amount of cash distributions paid     $ 38,097
Installment 1 - FY 2015      
Distribution Made To Limited Partner [Line Items]      
Declaration date Apr. 28, 2015    
Cash distribution declared per unit     $ 0.4425
Distribution date May 14, 2015    
Date of record May 13, 2015    
Aggregate amount of cash distributions paid     $ 38,097
Installment 2 - FY 2015      
Distribution Made To Limited Partner [Line Items]      
Declaration date Jul. 23, 2015    
Cash distribution declared per unit     $ 0.4425
Distribution date Aug. 14, 2015    
Date of record Aug. 13, 2015    
Aggregate amount of cash distributions paid     $ 38,097
Installment 3 - FY 2015      
Distribution Made To Limited Partner [Line Items]      
Declaration date Nov. 03, 2015    
Cash distribution declared per unit     $ 0.2125
Distribution date Nov. 13, 2015    
Date of record Nov. 12, 2015    
Aggregate amount of cash distributions paid     $ 18,015