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PARTNERS' CAPITAL - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 29, 2018 | May 31, 2018 | Jul. 28, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Partners' capital |  |  |  |  |  |
Cash contribution by affiliated entity |  |  |  |  | $ 2,142 |
Affiliated entity controlled by Mr. Craft |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Contribution of units by affiliated entity (in units) | 467,018 |  |  |  |  |
Cash contribution by affiliated entity |  |  |  |  | $ 2,100 | $ 1,000
MGP | ARLP |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Ownership percentage by general partners |  |  |  | 0.99% |  |
MGP | Intermediate Partnership |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Ownership percentage by general partners |  |  |  | 1.0001% |  |
MGP | Alliance Coal |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Ownership percentage by general partners |  |  |  | 0.001% |  |
Limited Partners' Capital |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Issuance of units to Owners of SGP in Simplification Transactions (in units) |  |  |  |  | 1,322,388 |
Repurchase and retire authorization |  | $ 100,000 |  |  |  |
Number of units retired |  |  |  | 5,460,639 |  |
Repurchase price (in dollars per unit) |  |  |  | $ 17.12 |  |
Aggregate treasury units retired |  |  |  | $ 93,500 |  |
Contribution of units by affiliated entity (in units) |  |  |  |  | (467,018) |
Exchange Transaction |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Common units issued in exchange |  |  |  | 56,128,141 |  |
Exchange Transaction | MGP |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Common units issued in exchange |  |  | 56,100,000 |  |  |
Exchange Transaction | SGP |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Common units issued in exchange |  |  | 28,141 |  |  |
Exchange Transaction | MGP | ARLP |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Ownership percentage by general partners |  |  | 0.99% |  |  |
Exchange Transaction | SGP | ARLP |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Ownership percentage by general partners |  |  | 0.01% |  |  |
Exchange Transaction | General Partner's Capital (Deficit) |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Partners' capital, Exchange Transaction reclassification |  |  |  | $ 306,700 |  |
Exchange Transaction | Limited Partners' Capital |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Partners' capital, Exchange Transaction reclassification |  |  |  | $ (306,700) |  |
Simplification Transactions |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Issuance of units to Owners of SGP in Simplification Transactions (in units) |  |  |  | 1,322,388 |  |
Simplification Transactions | Intermediate Partnership |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Ownership percentage by general partners |  | 1.0001% |  |  |  |
Simplification Transactions | Alliance Coal |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Ownership percentage by general partners |  | 0.001% |  |  |  |
Simplification Transactions | SGP |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Common units issued in exchange |  | 29,188,997 |  |  |  |
Issuance of units to Owners of SGP in Simplification Transactions (in units) |  | 1,322,388 |  |  |  |
Simplification Transactions | MGP | Intermediate Partnership |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Ownership percentage by general partners |  | 1.0001% |  |  |  |
Simplification Transactions | MGP | Alliance Coal |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Ownership percentage by general partners |  | 0.001% |  |  |  |
Simplification Transactions | SGP | Intermediate Partnership |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Ownership percentage by general partners |  | 1.0001% |  |  |  |
Simplification Transactions | SGP | Alliance Coal |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Ownership percentage by general partners |  | 0.001% |  |  |  |
Simplification Transactions | Limited Partners' Capital |  |  |  |  |  |
Partners' capital |  |  |  |  |  |
Number of units retired |  |  |  | 35 |  |

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