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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% |

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