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Acquisitions and Other Investments - Jamul Indian Village Development Corporation (Details) - USD ($)
3 Months Ended 12 Months Ended
May 25, 2018
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Provision for (recoveries on) loan loss and unfunded loan commitments     $ 0 $ (17,000,000.0) $ 89,800,000  
Proceeds from sale of loan     $ 0 15,200,000 0  
JIVDC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Provision for (recoveries on) loan loss and unfunded loan commitments   $ (17,000,000.0)   $ (17,000,000.0) 86,000,000.0  
Charges for certain advances         3,800,000  
Proceeds from sale of loan $ 15,200,000          
JIVDC | Secured credit facility            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Maximum borrowing capacity under credit facilities           $ 460,000,000
JIVDC | Secured credit facility | Term loan C facility            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Maximum borrowing capacity under credit facilities           $ 98,000,000.0
Term loan C facility | JIVDC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Provision for (recoveries on) loan loss and unfunded loan commitments         64,000,000.0  
Unfunded loan commitments | JIVDC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Provision for (recoveries on) loan loss and unfunded loan commitments         $ 22,000,000.0