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Commitments and Contingencies - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Site Contingency [Line Items]        
Environmental liabilities $ 3,600,000 $ 3,600,000   $ 3,700,000
Indemnification assets 3,600,000 3,600,000   3,700,000
Impairment charge 0.0   $ 2,300,000  
Insurance deductible     1,000,000.0  
Griffith Station [Member]        
Site Contingency [Line Items]        
Accrued insurance recovery     2,100,000 4,300,000
Insurance Settlements Receivable, Noncurrent       700,000
Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses 100,000 200,000 800,000  
Insurance Settlements Receivable, Noncurrent       $ 700,000
Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses $ 100,000 $ 200,000 $ 800,000  
Mars        
Site Contingency [Line Items]        
Equity Method Investment, Ownership Percentage 28.50% 28.50% 28500000.00%  
Mardi Gras Transportation System Company LLC        
Site Contingency [Line Items]        
Equity Method Investment, Ownership Percentage 65.00% 65.00%    
Caesar        
Site Contingency [Line Items]        
Equity Method Investment, Ownership Percentage 56.00% 56.00% 56000000.00%  
Cleopatra        
Site Contingency [Line Items]        
Equity Method Investment, Ownership Percentage 53.00% 53.00% 53000000.00%  
Endymion        
Site Contingency [Line Items]        
Equity Method Investment, Ownership Percentage 65.00% 65.00% 65000000.00%  
Proteus        
Site Contingency [Line Items]        
Equity Method Investment, Ownership Percentage 65.00% 65.00% 65000000.00%  
Ursa        
Site Contingency [Line Items]        
Equity Method Investment, Ownership Percentage 22.70% 22.70%    
KM Phoenix        
Site Contingency [Line Items]        
Equity Method Investment, Ownership Percentage 25.00% 25.00%