Significant Accounting Policies - Schedule of Revenue Concentration Risk (Details) - Customer Concentration Risk - Sales Revenue, Net	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Devon
Concentration Risk [Line Items]
Concentration risk	10.50%	10.40%	14.40%
Dow Hydrocarbons and Resources LLC
Concentration Risk [Line Items]
Concentration risk	10.00%	11.10%	11.20%
Marathon Petroleum and Resources LLC
Concentration Risk [Line Items]
Concentration risk	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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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