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Related Party Transactions - Other Agreements (Details) - Martin Resource Management - Cross Tolling Agreement
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Mar. 31, 2020
bbl
Dec. 31, 2019
USD ($)
Related Party Transaction      
Production minimum per day (in bbl) | bbl   6,500  
Capital recovery fee reimbursement, expired     $ 2,088
Annual escalation benchmark percentage   3.00%  
Scenario, Forecast      
Related Party Transaction      
Capital recovery fee reimbursement, expired $ 2,586    
Annual revenue decrease from contract expiration $ 2,145