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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Other Information (Details) - USD ($) $ in Thousands, shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other information |  |  |
Cash settlement of grants | $ 2,490 |  |
ARLP LTIP |  |  |
Other information |  |  |
Unit-based compensation expense | 8,100 | $ 10,400 | $ 10,800
Reduction in compensation expense | 1,000 |  |
Total unit-based obligation recorded | 1,300 | $ 20,200 |
Unrecognized compensation expense (in dollars) | $ 5,800 |  |
Weighted-average period for recognition of expense | 2 years |  |
Units available for grant | 1.7 |  |
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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- Definition Amount of partnership capital allocated for share-based obligations. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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