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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income (loss) attributable to ARLP | $ (46,664) | $ 58,070 | $ (191,447) | $ 334,498
Distributions to participating securities |  | $ (1,122) |  | (2,227)
Undistributed earnings attributable to participating securities |  |  |  | $ (3,196)
Weighted-average limited partner units outstanding - basic and diluted | 127,195,219 | 128,391,191 | 127,133,764 | 128,271,158
Earnings per limited partner unit - basic and diluted | $ (0.37) | $ 0.44 | $ (1.51) | $ 2.57
Anti-dilutive under the treasury stock method (in units) | 661,000 | 1,060,000 | 654,000 | 1,227,000
ARLP |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income (loss) attributable to ARLP | $ (46,664) | $ 58,070 | $ (191,447) | $ 334,498
Net income (loss) attributable to ARLP available to limited partners | $ (46,664) | $ 56,948 | $ (191,447) | $ 329,075

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