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Commitments and Contingencies - Narrative (Details) - USD ($)
Dec. 21, 2001
Sep. 30, 2018
Commitments and Contingencies [Line Items]    
Acquired interest (as a percent) 33.80%  
Minimum    
Commitments and Contingencies [Line Items]    
Lease term   1 year
Maximum    
Commitments and Contingencies [Line Items]    
Lease term   20 years
Contingent Promissory Note    
Commitments and Contingencies [Line Items]    
Principal amount of contingent promissory note $ 40,000,000  
Debt instrument term 20 years  
Contingent promissory note, maximum amount including interest $ 96,000,000