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Acquisitions and Other Investments - Retama Park Racetrack (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Promissory notes $ 0 $ 20,900
Pinnacle Retama Partners, LLC | Local government bonds | Other assets    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Local government bonds, amortized cost 7,500  
Pinnacle Retama Partners, LLC | Retama Development Corporation | Other assets    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Promissory notes $ 16,900  
Retama Nominal Holder, LLC    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ownership interest, equity method investment 1.00%  
Pinnacle Retama Partners, LLC    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ownership interest, subsidiary 75.50%