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Equity Method Investments (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2018 terminal	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) joint_venture	Jun. 30, 2017 USD ($)	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		$ 106,432		$ 106,432		$ 106,465
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		$ 18,195		$ 18,195		12,671
Non-current assets		241,564		241,564		244,329
Current liabilities		3,876		3,876		$ 1,798
Revenues		9,886	$ 7,022	17,876	$ 12,693
Gross profit		9,886	7,022	17,876	12,693
Net income		$ 4,800	$ 3,379	$ 7,512	$ 4,392
DKGP Energy Terminals, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (as percent)	50.00%
Equity method investment, number of terminals acquired | terminal	2

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