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Basis of Presentation - Equity Securities without Readily Determinable Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Equity Securities without Readily Determinable Fair Value [Line Items]    
Investment in Topgolf $ 70,777 $ 70,495
Topgolf International Inc    
Equity Securities without Readily Determinable Fair Value [Line Items]    
Investment in Topgolf $ 70,777 $ 70,495