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Summary of Significant Accounting Policies - Concentration Risk (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Concentration Risk [Line Items]
Sales	$ 59,852	$ 58,369	$ 75,388	$ 73,236	$ 85,145	$ 97,660	$ 79,462	$ 87,128
Targa Pipeline Mid-Continent West OK LLC
Concentration Risk [Line Items]
Sales									$ 85,780	$ 126,548	$ 144,583
Percentage of revenue									32.10%	36.20%	40.50%
Sinclair Crude Company
Concentration Risk [Line Items]
Sales									$ 74,810	$ 62,623
Percentage of revenue									28.00%	17.90%
Plains Marketing L.P.
Concentration Risk [Line Items]
Sales									$ 69,214	$ 102,182	$ 117,927
Percentage of revenue									25.90%	29.20%	33.00%

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