Major Operators (Details)	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenues	86.00%	84.00%	81.00%	78.00%
ConocoPhillips [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenues	40.00%	58.00%	35.00%	41.00%
EOG Resources [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenues	28.00%	13.00%	29.00%	21.00%
Devon [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenues	18.00%	13.00%	17.00%	16.00%

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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
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-Name Accounting Standards Codification
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