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

1 Months Ended

12 Months Ended

Jan. 26, 2022

Dec. 31, 2020

Feb. 29, 2020

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2017

Apr. 30, 2021

Dec. 31, 2018

Number of units

Balance at the beginning of the period (in units)

1,430,489

1,603,378

1,828,080

Granted (in units)

687,719

1,818,190

^[1]

1,430,489

682,155

424,486

Vested (in units)

(919,524)

(885,381)

^[2]

Grants canceled (in units)

^[2]

(675,302)

Forfeited (in units)

(118,204)

(8,552)

(21,476)

Balance at the end of the period (in units)

1,430,489

3,130,475

1,430,489

1,603,378

Weighted average grant date fair value per unit

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

$ 5.02

$ 20.39

$ 17.18

Granted (in dollars per unit)

6.03

^[1]

5.02

18.63

Vested (in dollars per unit)

$ 21.70

12.38

^[2]

Grants canceled (in dollars per unit)

^[2]

18.62

Forfeited (in dollars per unit)

5.48

$ 20.16

20.84

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

$ 5.02

$ 5.59

$ 5.02

$ 20.39

Intrinsic value (in dollars)

Intrinsic value of outstanding grants (in dollars)

$ 6,409

$ 39,569

$ 6,409

$ 17,349

$ 31,699

Other information

Common units issued

279,622

596,650

First Specified Minimum Guarantee

Other information

Guaranteed minimum (in shares)

921,430

Guaranteed minimum (in dollars per unit)

$ 9.62

$ 2.53

Second Specified Minimum Guarantee

Other information

Guaranteed minimum (in shares)

896,760

Guaranteed minimum (in dollars per unit)

$ 6.41

$ 3.79

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]

During the year ended December 31, 2019, we issued 596,650 unrestricted common units to LTIP participants.  The remaining vested units were settled in cash to satisfy tax withholding obligations of the LTIP participants.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were canceled during the reporting period.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that are outstanding with minimum value guarantee.

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