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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
NET INCOME (LOSS)	$ 24,826	$ (144,707)
OTHER COMPREHENSIVE INCOME (LOSS):
OTHER COMPREHENSIVE INCOME	2,231	938
COMPREHENSIVE INCOME (LOSS)	27,057	(143,769)
Less: Comprehensive income attributable to noncontrolling interest	(78)	(76)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ARLP	26,979	(143,845)
Defined benefit pension plan
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of prior service cost	47	46
Amortization of net actuarial loss (gain)	1,141	1,064
Total adjustments	1,188	1,110
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of net actuarial loss (gain)	1,043	(172)
Total adjustments	$ 1,043	$ (172)

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