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Summary of Significant Accounting Policies - Financing Extended to Jamul Tribe (Details) - Jamul Tribe - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 20, 2016
Mar. 31, 2017
Dec. 31, 2016
Loan Receivable      
Unamortized financing loan origination fee $ 6.0    
Term Loan C Facility | San Diego Gaming Ventures      
Loan Receivable      
Financing loan receivable, carrying value   $ 92.3 $ 92.1
Unamortized financing loan origination fee   5.9 5.9
Additional borrowing capacity under the financing facility 10.0    
Financing loan receivable, reserve allowance   0.0 0.0
Financing loan receivable, unpaid principal balance   98.2 98.0
Delayed Draw Term Loan C Facility Commitments | San Diego Gaming Ventures | Maximum      
Loan Receivable      
Additional borrowing capacity under the financing facility $ 15.0    
Subordinated Loans | San Diego Gaming Ventures      
Loan Receivable      
Financing interest rate margin - Rate two (as a percent) 14.00%    
Portion of contract financing interest rate to be paid in cash (as a percent) 12.00%    
Portion of contract interest rate to be paid-in-kind (as a percent) 2.00%    
LIBOR | Term Loan C Facility | San Diego Gaming Ventures      
Loan Receivable      
Financing variable rate basis LIBOR    
Financing interest rate margin (as a percent) 8.50%    
Financing variable rate basis floor (as a percent) 1.00%    
Prime Rate | Term Loan C Facility | San Diego Gaming Ventures      
Loan Receivable      
Financing variable rate basis prime rate    
Financing interest rate margin (as a percent) 8.50%    
Federal Funds Effective Rate | Term Loan C Facility | San Diego Gaming Ventures      
Loan Receivable      
Financing variable rate basis federal funds    
Financing interest rate margin (as a percent) 8.50%    
Other current assets | Term Loan C Facility | San Diego Gaming Ventures      
Loan Receivable      
Current portion of financing note receivable   $ 0.5 $ 0.7