Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 105,500		$ 104,000
Less: Accumulated depreciation	(42,600)		(41,300)
Property, plant and equipment, net	62,900		62,700
Impairment charge	0	$ 2,300
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	200		200
Rights-of-way
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,400		1,400
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	6,900		6,900
Pipeline and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	94,600		94,400
Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment	500		500
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,900		$ 600