Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 163,124	$ 166,504
Accumulated amortization	(116,359)	(107,972)
Net intangible assets	46,765	58,532
Terminalling services
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26,365	26,365
Accumulated amortization	(16,429)	(15,093)
Net intangible assets	$ 9,936	$ 11,272
Amortization Period	20 years	20 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 43,986	$ 43,986
Accumulated amortization	(41,630)	(41,195)
Net intangible assets	2,356	2,791
Supply contracts
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	87,578	87,578
Accumulated amortization	(54,655)	(46,430)
Net intangible assets	32,923	41,148
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	5,195	8,575
Accumulated amortization	(3,645)	(5,254)
Net intangible assets	$ 1,550	$ 3,321
Amortization Period		1 year
Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	3 years
Minimum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization Period	2 years	2 years
Minimum | Supply contracts
Finite-Lived Intangible Assets [Line Items]
Amortization Period	5 years	5 years
Minimum | Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization Period	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period	20 years
Maximum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization Period	15 years	15 years
Maximum | Supply contracts
Finite-Lived Intangible Assets [Line Items]
Amortization Period	15 years	15 years
Maximum | Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization Period	20 years	20 years