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Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Red River
Schedule of Equity Method Investments [Line Items]
Current Assets	$ 8,783		$ 8,783		$ 6,594
Non-current Assets	375,416		375,416		375,618
Current liabilities	3,319		3,319		4,945
Revenues	14,391	$ 10,112	26,017	$ 19,190
Gross profit	9,191	5,064	14,466	9,348
Net income	8,942	4,628	13,652	8,513
Andeavor Logistics
Schedule of Equity Method Investments [Line Items]
Current Assets	23,031		23,031		15,450
Non-current Assets	255,690		255,690		240,852
Current liabilities	8,103		8,103		4,362
Non-current liabilities	11		11		$ 0
Revenues	10,077	9,886	19,191	17,876
Gross profit	5,688	5,245	10,584	8,479
Net income	$ 5,249	$ 4,800	$ 9,666	$ 7,512

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