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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Grants Activity (Details) - ARLP LTIP - USD ($)
$ / shares in Units, $ in Thousands

1 Months Ended

12 Months Ended

Dec. 31, 2020

Feb. 29, 2020

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Number of units

Balance at the beginning of the period (in units)

1,603,378

1,828,080

1,694,026

Granted (in units)

1,430,489

^[1]

682,155

511,305

424,486

Vested (in units)

(919,524)

^[2]

(885,381)

^[3]

(331,502)

^[3]

Grants canceled (in units)

^[4]

(675,302)

Forfeited (in units)

(8,552)

(21,476)

(45,749)

Balance at the end of the period (in units)

1,430,489

1,430,489

1,603,378

1,828,080

1,694,026

Weighted average grant date fair value per unit

Balance at the beginning of the period (in dollars per unit)

$ 20.39

$ 17.18

$ 19.62

Granted (in dollars per unit)

5.02

^[1]

18.63

20.40

Vested (in dollars per unit)

$ 21.70

^[2]

12.38

^[3]

34.61

^[3]

Grants canceled (in dollars per unit)

^[4]

18.62

Forfeited (in dollars per unit)

$ 20.16

20.84

17.40

Balance at the end of the period (in dollars per unit)

$ 5.02

$ 5.02

$ 20.39

$ 17.18

$ 19.62

Intrinsic value (in dollars)

Intrinsic value of outstanding grants (in dollars)

$ 6,409

$ 6,409

$ 17,349

$ 31,699

$ 33,372

Other information

Common units issued upon vesting

279,622

596,650

191,858

2018 Grants

Number of units

Vested (in units)

(495,038)

2019 Grants

Number of units

Grants canceled (in units)

675,302

2020 Grants

Number of units

Granted (in units)

578,114

[1]	In December 2020, we modified the vesting requirements for certain restricted units that we granted in February 2020 which were determined to be improbable of vesting under the original vesting requirements (the "2020 Grants"). The new vesting requirements make it probable the modified restricted units will vest.  Also in December 2020, an additional 578,114 restricted units under these modified vesting requirements were granted.  The grant date fair value reflects the modification date fair value for those awards that were modified.
[2]	In February 2020, we issued 279,622 unrestricted common units to LTIP participants as a result of satisfying the vesting requirements for 424,486 restricted units that were granted in 2017.  The remaining vested units were settled in cash to satisfy tax withholding obligations of the LTIP participants.  In December 2020, we accelerated the vesting requirements for 495,038 restricted units that were granted in 2018 (the "2018 Grants") and settled these restricted units in cash.
[3]	During the years ended December 31, 2019 and 2018, we issued 596,650 and 191,858, respectively, unrestricted common units to LTIP participants.  The remaining vested units were settled in cash to satisfy tax withholding obligations of the LTIP participants.
[4]	In December 2020, 675,302 restricted units that were granted in 2019 (the "2019 Grants") were canceled since it was determined that the vesting requirements for these restricted units were not probable of being satisfied.

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