Segment Reporting - Information Concerning Business Activities (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Number of operating segments | segment			2
Segment Reporting Information [Line Items]
Revenues	$ 152,286,000	$ 484,433,000	$ 505,763,000	$ 929,601,000
Segment operating (losses) earnings	2,935,000	(643,000)	(17,005,000)	4,610,000
Depreciation and amortization	4,278,000	4,284,000	8,751,000	7,873,000
Property and equipment additions	668,000	4,770,000
Property and equipment acquired under finance leases		3,600,000	1,700,000	4,100,000
Leasehold Improvements
Segment Reporting Information [Line Items]
Property and equipment additions	300,000		500,000
Marketing
Segment Reporting Information [Line Items]
Revenues	140,141,000	467,040,000	477,362,000	896,801,000
Depreciation and amortization	1,857,000	2,304,000
Property and equipment additions	18,000	1,348,000
Inventory liquidation (losses) gains	(6,000,000.0)	1,000,000.0	18,200,000	(3,500,000)
Transportation
Segment Reporting Information [Line Items]
Revenues	12,145,000	17,393,000	28,401,000	32,800,000
Depreciation and amortization	2,421,000	1,980,000
Property and equipment additions	323,000	3,422,000
Other
Segment Reporting Information [Line Items]
Revenues	0	0
Depreciation and amortization	0	0
Property and equipment additions	327,000	0
Operating Segments
Segment Reporting Information [Line Items]
Revenues			505,763,000	929,601,000
Segment operating (losses) earnings	5,666,000	1,939,000	(11,380,000)	9,876,000
Depreciation and amortization			8,751,000	7,873,000
Property and equipment additions			2,880,000	13,121,000
Operating Segments | Marketing
Segment Reporting Information [Line Items]
Revenues			477,362,000	896,801,000
Segment operating (losses) earnings	6,830,000	962,000	(10,821,000)	8,060,000
Depreciation and amortization			3,864,000	4,426,000
Property and equipment additions			2,050,000	3,002,000
Operating Segments | Transportation
Segment Reporting Information [Line Items]
Revenues			28,401,000	32,800,000
Segment operating (losses) earnings	(1,164,000)	977,000	(559,000)	1,816,000
Depreciation and amortization			4,887,000	3,447,000
Property and equipment additions			364,000	10,119,000
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			466,000	0
Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0