Major Operators (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenues	78.00%	80.00%	77.00%
Conoco Phillips [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenues	42.00%	33.00%	39.00%
EOG Resources [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenues	20.00%	29.00%	22.00%
Devon [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenues	16.00%	18.00%	16.00%