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Summary of Significant Accounting Policies - Long-term Asset Related to Jamul Tribe (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
USD ($)
a
ft²
item
Dec. 31, 2015
USD ($)
Financing provided    
Advances to the Jamul Tribe | $ $ 360,938 $ 197,722
Jamul Tribe    
Long-term asset related to the Jamul Tribe    
Land owned (in acres) | a 6  
Hollywood Casino Jamul - San Diego    
Number of stories at facility 3  
Size of gaming floor at and entertainment facility (in square feet) | ft² 200,000  
Number of slot machines at facility 1,731  
Number of table games at facility 40  
Number of parking spaces 1,800  
Jamul Tribe | Senior Loans    
Financing provided    
Advances to the Jamul Tribe | $ $ 360,900 197,700
Accrued interest | $ $ 33,200 $ 13,900