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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
NET INCOME	$ 406,926	$ 367,470	$ 304,201
OTHER COMPREHENSIVE INCOME (LOSS)
Total adjustments	(31,122)	5,069	(13,400)
OTHER COMPREHENSIVE INCOME (LOSS)	(31,122)	5,069	(13,400)
COMPREHENSIVE INCOME	375,804	372,539	290,801
Less: Comprehensive income attributable to noncontrolling interest	(7,512)	(866)	(563)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ARLP	368,292	371,673	290,238
Defined benefit pension plan
OTHER COMPREHENSIVE INCOME (LOSS)
Amortization of prior service cost	186	186	186
Net actuarial loss	(7,350)	(3,326)	(6,610)
Amortization of net actuarial loss (gain)	3,922	3,608	3,054
Total adjustments	(3,242)	468	(3,370)
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS)
Net actuarial loss	(23,298)	4,599	(7,938)
Amortization of net actuarial loss (gain)	(4,582)	2	(2,092)
Total adjustments	$ (27,880)	$ 4,601	$ (10,030)

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