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Leases - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Lessee, Lease, Description [Line Items]    
Present value of lease liabilities $ 209,748,000  
Variable lease cost 0  
Port Terminal    
Lessee, Lease, Description [Line Items]    
Cash collateral 181,100,000  
Ships | Silver Whisper    
Lessee, Lease, Description [Line Items]    
Present value of lease liabilities $ 31,500,000 $ 31,500,000
Minimum | Real Estate    
Lessee, Lease, Description [Line Items]    
Renewal term 1 year  
Minimum | Berthing Agreement    
Lessee, Lease, Description [Line Items]    
Renewal term 1 year  
Maximum | Real Estate    
Lessee, Lease, Description [Line Items]    
Renewal term 10 years  
Maximum | Berthing Agreement    
Lessee, Lease, Description [Line Items]    
Renewal term 20 years