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Investments in Unconsolidated Entities - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Goodwill   $ 504,173 $ 504,173  
Proceeds from equity method investment, distribution   10,000 19,000 $ 10,000
Invidi Technologies Corporation        
Schedule of Equity Method Investments [Line Items]        
Cost method investment sold $ 19,000      
Cost method investments $ 11,000      
Gain on sale of cost method investment     $ 9,000  
Equity Method Investments        
Schedule of Equity Method Investments [Line Items]        
Goodwill   $ 24,000