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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Other (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 26, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other information
Cash settlement of grants			$ 2,490
ARLP LTIP
Other information
Unit-based compensation expense		$ 5,400	8,100	$ 10,400
Reduction in compensation expense			1,000
Total unit-based obligation recorded		6,700	$ 1,300
Unrecognized compensation expense (in dollars)		$ 10,800
Weighted-average period for recognition of expense		1 year 7 months 6 days
Additional grants authorized (in units)	694,919
2018 Grants | ARLP LTIP
Other information
Incremental compensation cost		$ 5,400
2019 Grants | ARLP LTIP
Other information
Reversal of cumulative previously recognized expenses		$ 4,800

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