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Noncontrolling Interests - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net Income (Loss) Attributable to Noncontrolling Interest $ 207 $ 0 $ 0
Partners' Capital Account, Distributions 0    
Partners' Capital Account, Contributions $ 0