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Organization and Basis of Presentation Organization and Basis of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Operating lease right-of-use assets $ 19,186    
Distributions from equity method investments 804 $ 660  
Operating lease liability $ 19,186   $ 20,200