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Non-controlling Interests (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Nov. 30, 2014
Noncontrolling Interest [Line Items]        
Limited partner units (in units) 90   90  
Distributions to non-controlling interest holders $ 173 $ 173    
Non-controlling Interests        
Noncontrolling Interest [Line Items]        
Limited partner units (in units)       405,908
Units issued       $ 10,100
Units issued (in usd per share)       $ 25.00