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Net (Loss) / Income from continuing operations Per Unit - Reverse Split (Details) - shares
 3 Months Ended
Mar. 27, 2019
Dec. 31, 2018
Dec. 31, 2017
Common Partnership Units Issued   18,178,100 18,178,100
Common Partnership Units Outstanding   18,178,100 18,178,100
General Partner Units Issued   348,570 348,570
General Partner Units Outstanding   348,570 348,570
Reverse unit split, description one for seven reverse unit split    
Before Reverse Split      
Common Partnership Units Issued   127,246,692  
Common Partnership Units Outstanding   127,246,692  
General Partner Units Issued   2,439,989  
General Partner Units Outstanding   2,439,989