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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Site Contingency [Line Items]      
Environmental liabilities $ 3,600 $ 3,400  
Indemnification assets 3,600 3,400  
Impairment charge $ 0    
Griffith Station [Member]      
Site Contingency [Line Items]      
Accrued insurance recovery   $ 2,500  
Mars      
Site Contingency [Line Items]      
Equity Method Investment, Ownership Percentage 28.50%   28500000.00%
Mardi Gras Transportation System Company LLC      
Site Contingency [Line Items]      
Equity Method Investment, Ownership Percentage 65.00%    
Caesar      
Site Contingency [Line Items]      
Equity Method Investment, Ownership Percentage 56.00%   56000000.00%
Cleopatra      
Site Contingency [Line Items]      
Equity Method Investment, Ownership Percentage 53.00%   53000000.00%
Endymion      
Site Contingency [Line Items]      
Equity Method Investment, Ownership Percentage 65.00%   65000000.00%
Proteus      
Site Contingency [Line Items]      
Equity Method Investment, Ownership Percentage 65.00%   65000000.00%
Ursa      
Site Contingency [Line Items]      
Equity Method Investment, Ownership Percentage 22.70%    
KM Phoenix      
Site Contingency [Line Items]      
Equity Method Investment, Ownership Percentage 25.00%