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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
NET INCOME (LOSS)	$ 27,235	$ 39,201	$ (164,151)	$ 380,989
OTHER COMPREHENSIVE INCOME (LOSS):
OTHER COMPREHENSIVE INCOME (LOSS)	844	(119)	2,721	(3,821)
COMPREHENSIVE INCOME (LOSS)	28,079	39,082	(161,430)	377,168
Less: Comprehensive income attributable to noncontrolling interest	(36)	(117)	(97)	(7,407)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ARLP	28,043	38,965	(161,527)	369,761
Defined benefit pension plan
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of prior service cost	47	46	140	139
Amortization of net actuarial gain loss	969	980	3,096	2,941
Total adjustments	1,016	1,026	3,236	3,080
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS):
Net actuarial loss				(3,465)
Amortization of net actuarial gain loss	(172)	(1,145)	(515)	(3,436)
Total adjustments	$ (172)	$ (1,145)	$ (515)	$ (6,901)

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