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Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Red River
Schedule of Equity Method Investments [Line Items]
Current Assets	$ 11,618		$ 11,618		$ 6,594
Non-current Assets	377,059		377,059		375,618
Current liabilities	5,168		5,168		4,945
Revenues	19,195	$ 14,446	45,212	$ 33,635
Gross profit	14,469	9,110	28,935	18,457
Net income	14,342	8,709	27,994	17,221
Andeavor Logistics
Schedule of Equity Method Investments [Line Items]
Current Assets	31,834		31,834		15,450
Non-current Assets	260,427		260,427		240,852
Current liabilities	8,060		8,060		$ 4,362
Revenues	14,602	8,384	33,793	26,260
Gross profit	9,965	4,694	20,549	13,173
Net income	$ 9,458	$ 4,055	$ 19,124	$ 11,567

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The amount of current assets reported by an equity method investment of the entity.

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