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Consolidated Statements of Changes in Partners' Capital (Parentheticals) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Limited Partners Common      
Distributions declared and paid (adjusted for the March 2019 Reverse Split) $ 1.26 $ 2.24 $ 2.24
Limited Partners Preferred      
Distributions declared and paid (adjusted for the March 2019 Reverse Split) $ 0.42 $ 0.86 $ 0.86