Significant Accounting Policies - Schedule of Revenue Concentration Risk (Details) - Customer Concentration Risk - Sales Revenue, Net	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Devon
Concentration Risk [Line Items]
Concentration risk	14.40%	10.50%	10.40%
Dow Hydrocarbons and Resources LLC
Concentration Risk [Line Items]
Concentration risk	13.20%	10.00%	11.10%
Marathon Petroleum and Resources LLC
Concentration Risk [Line Items]
Concentration risk	12.20%	13.80%	11.50%

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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