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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