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Debt - BP Loan and Plains Credit Facility (Details) - Plains Credit Facility - USD ($)
$ in Millions
Jun. 30, 2022
Jan. 31, 2022
Sep. 16, 2021
May 01, 2021
Revolving line of credit | Plains        
Debt Instrument [Line Items]        
Maximum borrowing capacity (up to)     $ 20.0 $ 20.0
Outstanding line of credit $ 0.0      
Remaining borrowing capacity 11.0   18.0  
Revolving line of credit | Minimum | Plains        
Debt Instrument [Line Items]        
Interest rate (as a percent)       3.25%
Standby letters of credit | Plains        
Debt Instrument [Line Items]        
Maximum borrowing capacity (up to)     $ 2.0  
Outstanding line of credit $ 0.0      
Standby letters of credit | Berkshire Bank        
Debt Instrument [Line Items]        
Loan pledged as collateral   $ 7.0