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EARNINGS PER LIMITED PARTNER UNIT - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
EARNINGS PER LIMITED PARTNER UNIT |  |  |  |
Net income (loss) attributable to ARLP | $ 44,035 | $ (46,664) | $ 68,783 | $ (191,447)
Distributions to participating securities | (401) |  | (619) |
Undistributed earnings attributable to participating securities | (825) |  | (934) |
Net income (loss) attributable to ARLP available to limited partners | $ 42,809 | $ (46,664) | $ 67,230 | $ (191,447)
Weighted-average limited partner units outstanding - basic and diluted | 127,195,219 | 127,195,219 | 127,195,219 | 127,133,764
Earnings per limited partner unit - basic and diluted | $ 0.34 | $ (0.37) | $ 0.53 | $ (1.51)
Anti-dilutive under the treasury stock method (in units) | 1,525,000 | 661,000 | 1,397,000 | 654,000

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