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Commitments and Contingencies PGL Commitments (Details) - USD ($)
 12 Months Ended
Dec. 20, 2011
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sponsor Fees [Line Items]        
Payment to option holder, term   10 years    
Accrued liabilities   $ (334,175,000) $ (255,146,000)  
Parking Fee, Per Space   80    
Kansas Star        
Sponsor Fees [Line Items]        
Payment to option holder, term 10 years      
Diamond Jo Dubuque        
Sponsor Fees [Line Items]        
Sponsor Fees   $ 3,100,000 3,100,000 $ 3,000,000
Sponsor Fee Percentage   4.50%    
Diamond Jo Worth        
Sponsor Fees [Line Items]        
Sponsor Fees   $ 4,900,000 5,000,000 $ 4,900,000
Sponsor Fee Percentage   5.76%    
Annual Donations for Education in Operating Area [Member] | Kansas Star        
Sponsor Fees [Line Items]        
Amount of other commitment   $ 1,500,000    
Mulvane Special Tax Assessment for Utilities [Member] | Kansas Star        
Sponsor Fees [Line Items]        
Other Commitment, Time Period   15 years    
Debt Issued by Counterparty   $ 19,700,000    
Special Tax Assessment   1,700,000 1,700,000  
Accrued liabilities   (7,400,000) (8,200,000)  
Mulvane Special Tax Assessment for Utilities, Discount [Member] | Kansas Star        
Sponsor Fees [Line Items]        
Accrued liabilities   (3,000,000) (3,500,000)  
Additional Mulvane Special Tax Assessment for Utilities [Member] | Kansas Star        
Sponsor Fees [Line Items]        
Debt Issued by Counterparty   5,000,000    
Special Tax Assessment   1,700,000    
Dubuque Minimum Assessment Agreement [Member] | Diamond Jo Dubuque        
Sponsor Fees [Line Items]        
Property Taxes, Minimum Agreed Taxable Value   57,900,000    
Other Commitment, Minimum Annual Payments   1,900,000    
Accrued Liabilities [Member] | Dubuque Minimum Assessment Agreement [Member] | Diamond Jo Dubuque        
Sponsor Fees [Line Items]        
Other Commitment, Obligation   1,900,000    
Other Liabilities [Member] | Dubuque Minimum Assessment Agreement [Member] | Diamond Jo Dubuque        
Sponsor Fees [Line Items]        
Other Commitment, Obligation   13,400,000 13,800,000  
Other Commitment, Discount on Obligation   $ 2,500,000 $ 2,600,000