UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Total revenues	$ 467,891	$ 295,311	$ 1,307,564	$ 913,600
Costs and expenses:
General and administrative	1,533	2,787	6,100	6,884
Depreciation, depletion and amortization	2,340	3,240	7,014	10,772
Total costs and expenses	465,652	296,601	1,299,950	915,855
Operating earnings (losses)	2,239	(1,290)	7,614	(2,255)
Other income (expense):
Loss on deconsolidation of subsidiary	0	(1,870)	0	(3,505)
Impairment of investment in unconsolidated affiliate	0	(2,500)	0	(2,500)
Interest income	601	370	1,486	789
Interest expense	(26)	(8)	(60)	(10)
Total other income (expense), net	575	(4,008)	1,426	(5,226)
(Losses) earnings before income taxes	2,814	(5,298)	9,040	(7,481)
Income tax benefit (provision)	(779)	2,265	(2,247)	3,306
Net (losses) earnings	$ 2,035	$ (3,033)	$ 6,793	$ (4,175)
Earnings (losses) per share:
Basic net (losses) earnings per common share (in dollars per share)	$ 0.48	$ (0.72)	$ 1.61	$ (0.99)
Diluted net (losses) earnings per common share (in dollars per share)	0.48	(0.72)	1.61	(0.99)
Dividends per common share (in dollars per share)	$ 0.22	$ 0.22	$ 0.66	$ 0.66
Marketing
Revenues:
Total revenues	$ 453,626	$ 282,229	$ 1,266,055	$ 872,020
Costs and expenses:
Cost of goods and services sold	449,367	277,906	1,250,233	860,567
Transportation
Revenues:
Total revenues	14,265	13,082	41,509	40,153
Costs and expenses:
Cost of goods and services sold	12,412	12,668	36,603	36,681
Oil and natural gas
Revenues:
Total revenues	0	0	0	1,427
Costs and expenses:
Cost of goods and services sold	$ 0	$ 0	$ 0	$ 951