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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
NET INCOME (LOSS)	$ 57,724	$ 27,235	$ 126,715	$ (164,151)
OTHER COMPREHENSIVE INCOME (LOSS):
OTHER COMPREHENSIVE INCOME	2,231	844	6,693	2,721
COMPREHENSIVE INCOME (LOSS)	59,955	28,079	133,408	(161,430)
Less: Comprehensive income attributable to noncontrolling interest	(176)	(36)	(384)	(97)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ARLP	59,779	28,043	133,024	(161,527)
Defined benefit pension plan
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of prior service cost	47	47	140	140
Amortization of net actuarial loss (gain)	1,141	969	3,424	3,096
Total adjustments	1,188	1,016	3,564	3,236
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of net actuarial loss (gain)	1,043	(172)	3,129	(515)
Total adjustments	$ 1,043	$ (172)	$ 3,129	$ (515)

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