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Equity Method Investments (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2018 terminal	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) joint_venture	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments, number of joint ventures | joint_venture				2
Investment in joint ventures		$ 105,233		$ 105,233		$ 106,465
Equity method investment, number of terminals acquired | terminal	2
CP LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)		50.00%		50.00%
Rangeland Rio
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)		33.00%		33.00%
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Current assets		$ 16,103		$ 16,103		12,671
Non-current assets		240,323		240,323		244,329
Current liabilities		4,000		4,000		$ 1,798
Revenues		8,384	$ 7,026	26,260	$ 19,719
Gross profit		8,384	7,026	26,260	19,719
Net income		$ 4,055	$ 2,282	$ 11,567	$ 6,674
DKGP Energy Terminals, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)	50.00%

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