COMMON UNIT-BASED COMPENSATION PLANS - LTIP Other (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 27, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other information
Cash settlement of grants				$ 2,490
ARLP LTIP
Other information
Unit-based compensation expense		$ 9,400	$ 5,400	$ 8,100
Reduction in compensation expense			1,000
Total unit-based obligation recorded		16,000	$ 6,700
Unrecognized compensation expense (in dollars)		$ 11,400
Weighted-average period for recognition of expense		9 months 18 days
Additional grants authorized (in units)	462,225
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