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Summary of Significant Accounting Policies (Details 3) - Jamul Tribe
$ in Millions
Apr. 05, 2013
USD ($)
ft²
a
item
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Long-term asset related to the Jamul Tribe      
Land owned (in acres) | a 6    
Proposed facility development cost $ 390.0    
Number of stories at facility | item 3    
Size of gaming floor at facility (in square feet) | ft² 200,000    
Number of slot machines at facility | item 1,700    
Number of table games at facility | item 43    
Number of parking spaces | item 1,800    
Loan commitment   $ 400.0  
Anticipated loan funding   390.0  
Note receivable   143.9 $ 62.0
Interest receivable   $ 10.1 $ 3.3