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Accounting Policies Net Income per Limited Partner Unit (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
General partner's ownership interest 2.00% 2.00% 2.00%
Distributions from equity method investments $ 1,162 $ 753 $ 0