Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property and Equipment
Total property and equipment	$ 1,787,407		$ 1,787,407	$ 1,727,721
Less accumulated depreciation	682,544		682,544	595,089
Total	1,104,863		1,104,863	1,132,632
Assets held for sale	4,600		4,600	8,100
Long-lived assets subject to impairment	44,500		44,500
Long-lived asset impairment	1,400	$ 600	2,022	414	$ 809
Cost of sales
Property and Equipment
Depreciation expense allocated			87,900	86,900	88,500
Selling, general and administrative expenses
Property and Equipment
Depreciation expense allocated			8,800	9,000	$ 7,900
Buildings and improvements
Property and Equipment
Total property and equipment	1,196,502		1,196,502	1,126,645
Land
Property and Equipment
Total property and equipment	452,104		452,104	456,334
Fixtures and equipment
Property and Equipment
Total property and equipment	46,848		46,848	44,479
Idle Plant Assets [Member]
Property and Equipment
Total property and equipment	30,500		30,500	30,500
Total	30,500		30,500
Construction in process
Property and Equipment
Total property and equipment	27,951		27,951	37,636
Terminal Expansion And Upgrades [Member]
Property and Equipment
Total property and equipment	4,800		4,800	9,600
Retail Gasoline Stations
Property and Equipment
Total property and equipment	23,100		23,100	28,000
Capitalized internal use software
Property and Equipment
Total property and equipment	$ 33,502		$ 33,502	$ 32,127