UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Marketing	$ 301,176	$ 278,529	$ 589,791	$ 514,923
Transportation	13,616	13,860	27,071	27,207
Oil and natural gas	410	774	1,427	1,564
Total revenues	315,202	293,163	618,289	543,694
Costs and expenses:
Marketing	297,508	268,780	582,661	497,837
Transportation	11,851	11,309	24,013	22,498
Oil and natural gas	201	779	951	1,410
General and administrative	1,460	1,938	4,097	4,138
Depreciation, depletion and amortization	3,563	4,756	7,532	9,871
Total costs and expenses	314,583	287,562	619,254	535,754
Operating earnings (losses)	619	5,601	(965)	7,940
Other income (expense):
Loss on deconsolidation of subsidiary (Note 3)	1,635	0	1,635	0
Losses from equity investments	0	(209)	0	(400)
Interest income	260	96	419	199
Interest expense	(1)	0	(2)	0
Total other income (expense), net	(1,376)	(113)	(1,218)	(201)
(Losses) earnings before income taxes	(757)	5,488	(2,183)	7,739
Income tax benefit (provision)	475	(2,084)	1,041	(2,905)
Net (losses) earnings	$ (282)	$ 3,404	$ (1,142)	$ 4,834
Earnings (losses) per share:
Basic and diluted net (losses) earnings per common share (in dollars per share)	$ (0.07)	$ 0.81	$ (0.27)	$ 1.15
Weighted average number of common shares outstanding (in shares)	4,218	4,218	4,218	4,218
Dividends per common share (in dollars per share)	$ 0.22	$ 0.22	$ 0.44	$ 0.44