Summary of Significant Accounting Policies (Details)	3 Months Ended
Mar. 31, 2021
Net sales \| Customer concentration risk \| Murphy USA
Concentration Risk [Line Items]
Major customer percentage of net sales	14.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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