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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
NET INCOME (LOSS)	$ 44,165	$ (46,679)	$ 68,991	$ (191,386)
OTHER COMPREHENSIVE INCOME (LOSS):
OTHER COMPREHENSIVE INCOME	2,231	939	4,462	1,877
COMPREHENSIVE INCOME (LOSS)	46,396	(45,740)	73,453	(189,509)
Less: Comprehensive loss (income) attributable to noncontrolling interest	(130)	15	(208)	(61)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ARLP	46,266	(45,725)	73,245	(189,570)
Defined benefit pension plan
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of prior service cost	46	47	93	93
Amortization of net actuarial loss (gain)	1,142	1,063	2,283	2,127
Total adjustments	1,188	1,110	2,376	2,220
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of net actuarial loss (gain)	1,043	(171)	2,086	(343)
Total adjustments	$ 1,043	$ (171)	$ 2,086	$ (343)

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