Segment Reporting - Information Concerning Business Activities (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Number of operating segments | segment			2
Segment Reporting Information [Line Items]
Revenues	$ 266,904,000	$ 450,307,000	$ 772,667,000	$ 1,379,908,000
Segment operating (losses) earnings	6,056,000	303,000	(10,949,000)	4,913,000
Depreciation and amortization	4,859,000	4,393,000	13,610,000	12,266,000
Property and equipment additions	704,000	12,304,000
Property and equipment acquired under finance leases			1,700,000	4,100,000
Leasehold Improvements
Segment Reporting Information [Line Items]
Property and equipment additions	100,000		500,000
Marketing
Segment Reporting Information [Line Items]
Revenues	245,184,000	434,609,000	722,546,000	1,331,410,000
Depreciation and amortization	1,836,000	2,214,000
Property and equipment additions	684,000	3,894,000
Inventory liquidation (losses) gains	(12,000)	(2,100,000)	(18,200,000)	1,500,000
Transportation
Segment Reporting Information [Line Items]
Revenues	21,720,000	15,698,000	50,121,000	48,498,000
Depreciation and amortization	3,023,000	2,179,000
Property and equipment additions	(32,000)	8,410,000
Other
Segment Reporting Information [Line Items]
Revenues	0	0
Depreciation and amortization	0	0
Property and equipment additions	52,000	0
Operating Segments
Segment Reporting Information [Line Items]
Revenues			772,667,000	1,379,908,000
Segment operating (losses) earnings	7,461,000	3,042,000	(3,919,000)	12,918,000
Depreciation and amortization			13,610,000	12,266,000
Property and equipment additions			3,589,000	25,425,000
Operating Segments | Marketing
Segment Reporting Information [Line Items]
Revenues			722,546,000	1,331,410,000
Segment operating (losses) earnings	5,869,000	2,888,000	(4,952,000)	10,948,000
Depreciation and amortization			5,700,000	6,640,000
Property and equipment additions			2,734,000	6,896,000
Operating Segments | Transportation
Segment Reporting Information [Line Items]
Revenues			50,121,000	48,498,000
Segment operating (losses) earnings	1,592,000	154,000	1,033,000	1,970,000
Depreciation and amortization			7,910,000	5,626,000
Property and equipment additions			332,000	18,529,000
Operating Segments | Other
Segment Reporting Information [Line Items]
Revenues			0	0
Segment operating (losses) earnings	0	0	0	0
Depreciation and amortization			0	0
Property and equipment additions			523,000	0
Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0