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Summary of Significant Accounting Policies - Concentration Risk (Details) - USD ($) $ in Thousands	3 Months Ended									9 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Oct. 01, 2016	Dec. 31, 2018	Dec. 31, 2017
Concentration Risk [Line Items]
Sales	$ 85,145	$ 97,660	$ 79,462	$ 87,128	$ 93,206	$ 80,892	$ 84,851	$ 98,350
Successor | Plains Marketing, L.P.
Concentration Risk [Line Items]
Sales									$ 32,022		$ 102,182	$ 117,927
Percentage of revenue									32.50%		29.20%	33.00%
Successor | Targa Midstream Services L.P.
Concentration Risk [Line Items]
Sales									$ 35,845		$ 126,548	$ 144,583
Percentage of revenue									36.40%		36.20%	40.50%
Successor | Sinclair Crude Company
Concentration Risk [Line Items]
Sales											$ 62,623
Percentage of revenue											17.90%
Predecessor | Plains Marketing, L.P.
Concentration Risk [Line Items]
Sales										$ 110,370
Percentage of revenue										37.60%
Predecessor | Targa Midstream Services L.P.
Concentration Risk [Line Items]
Sales										$ 108,238
Percentage of revenue										36.80%

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