Segment Reporting - Identifiable Assets by Industry Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Assets	$ 374,703	$ 296,187
Operating Segments
Segment Reporting Information [Line Items]
Assets	374,703	296,187	$ 330,842
Operating Segments | Marketing
Segment Reporting Information [Line Items]
Assets	162,770	128,441	141,402
Operating Segments | Transportation
Segment Reporting Information [Line Items]
Assets	67,167	72,247	58,483
Operating Segments | Pipeline and storage
Segment Reporting Information [Line Items]
Assets	25,569	24,541	0
Other
Segment Reporting Information [Line Items]
Assets	$ 119,197	$ 70,958	$ 130,957