Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 30,546		$ 81,223		$ 70,760	$ 148,008
Gain on asset sales and disposals	465		246		465	502
Total revenues and other income	31,011		81,469		71,225	148,510
Operating expenses
Operating and maintenance expenses	8,217		12,459		13,419	20,819
Depreciation, depletion and amortization	2,062		3,970		4,074	8,362
General and administrative expenses	3,621		4,196		7,534	8,546
Asset impairments	132,283		0		132,283	0
Total operating expenses	146,183		20,625		157,310	37,727
Income (loss) from operations	(115,172)		60,844		(86,085)	110,783
Other expenses, net
Interest expense, net	(10,329)		(12,456)		(20,637)	(26,630)
Loss on extinguishment of debt	0		(29,282)		0	(29,282)
Other Expenses	(10,329)		(41,738)		(20,637)	(55,912)
Net income (loss) from continuing operations	(125,501)		19,106		(106,722)	54,871
Income from discontinued operations	0		245		0	199
Net income (loss)	(125,501)	[1]	19,351	[2]	(106,722)	55,070
Less: income attributable to preferred unitholders	(7,613)		(7,500)		(15,113)	(15,000)
Net income (loss) attributable to common unitholders and general partner	(133,114)		11,851		(121,835)	40,070
Net income (loss) attributable to common unitholders	(130,452)		11,614		(119,398)	39,269
Net income (loss) attributable to the general partner	$ (2,662)		$ 237		$ (2,437)	$ 801
Income from continuing operations per common unit
Basic (in dollars per share)	$ (10.64)		$ 0.93		$ (9.74)	$ 3.19
Diluted (in dollars per share)	(10.64)		0.85		(9.74)	2.58
Net income per common unit
Basic (in dollars per share)	(10.64)		0.95		(9.74)	3.20
Diluted (in dollars per share)	$ (10.64)		$ 0.87		$ (9.74)	$ 2.59
Comprehensive income (loss) from unconsolidated investment and other	$ 1,359		$ (825)		$ 336	$ 180
Comprehensive income (loss)	(124,142)		18,526		(106,386)	55,250
Coal Royalty and Other
Revenues	31,666		64,616		63,099	114,118
Soda Ash
Revenues	(3,058)		11,333		3,214	23,015
Transportation and processing services revenues | Coal Royalty and Other
Revenues	$ 1,938		$ 5,274		$ 4,447	$ 10,875

[1] Net loss includes $7.6 million attributable to preferred unitholders that accumulated during the period, of which $7.46 million is allocated to the common unitholders and $0.15 million is allocated to the general partner.

[2] Net income includes $7.5 million attributable to preferred unitholders that accumulated during the period, of which $7.35 million is allocated to the common unitholders and $0.15 million is allocated to the general partner.