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Summary of Significant Accounting Policies - Long-term Asset Related to Jamul Tribe (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Receivables - Loans and Debt Securities Acquired with Deteriorated Credit Quality |  |
Financing loan receivable, reserve allowance | $ 5,635 | $ 0
Financing loan receivable, unpaid principal balance | 98,100 | 98,000
Loans to the Jamul Tribe | 84,152 | $ 91,401
Delayed Draw Term Loan C Facility Commitments |  |
Receivables - Loans and Debt Securities Acquired with Deteriorated Credit Quality |  |
Additional borrowing capacity under the financing facility | $ 15,000 |

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