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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Schedule of changes in accumulated other comprehensive income (loss), by component | Changes in accumulated other comprehensive income (loss), by component, were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Projected |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ | ​
​ | ​ | Pension and | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Postretirement Benefit | ​ | Translation | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Obligations |  | Adjustment |  | Other |  | Total |
Balance at December 31, 2021 | ​ | $ | 4,444 | ​ | $ | 308 | ​ | $ | 21 | ​ | $ | 4,773 | ​
Unrecognized actuarial gain, net of tax of $(0.2) million | ​ |  | 2,428 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,428 | ​
Pension settlement, net of tax of $(0.8) million | ​ |  | 915 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 915 | ​
Reclassification of foreign currency losses on investments sold, net of tax of $0.2 million | ​ | ​ | — | ​ | ​ | (500) | ​ | ​ | — | ​ | ​ | (500) | ​
Foreign currency translation adjustment | ​ | ​ | — | ​ | ​ | (1,385) | ​ | ​ | — | ​ | ​ | (1,385) | ​
Interest rate swap | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (21) | ​ | ​ | (21) | ​
Balance at December 31, 2022 | ​ | ​ | 7,787 | ​ | ​ | (1,577) | ​ | ​ | — | ​ | ​ | 6,210 | ​
Unrecognized actuarial gain, net of tax of $0 | ​ | ​ | 2,035 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,035 | ​
Pension settlement, net of tax of $(0.2) million | ​ | ​ | 195 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 195 | ​
Reclassification of foreign currency losses on investments, net of tax of $0 | ​ | ​ | — | ​ | ​ | 1,348 | ​ | ​ | — | ​ | ​ | 1,348 | ​
Foreign currency translation adjustment | ​ | ​ | — | ​ | ​ | 229 | ​ | ​ | — | ​ | ​ | 229 | ​
Interest rate swap, net of tax of $0.6 million | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,749) | ​ | ​ | (1,749) | ​
Balance at December 31, 2023 | ​ | ​ | 10,017 | ​ | ​ | — | ​ | ​ | (1,749) | ​ | ​ | 8,268 | ​
Unrecognized actuarial gain, net of tax of $(0.1) million | ​ | ​ | 1,637 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,637 | ​
Interest rate swap, net of tax of $(0.5) million | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 872 | ​ | ​ | 872 | ​
Balance at December 31, 2024 | ​ | $ | 11,654 | ​ | $ | — | ​ | $ | (877) | ​ | $ | 10,777 | ​
Schedule of restructuring expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | US | ​ | ​ | International | ​ | ​ | ​
​ | ​ | ​ | Telecom | ​ | ​ | Telecom | ​ | ​ | Total
Employee termination benefits | ​ | $ | 1,960 | ​ | $ | 4,681 | ​ | $ | 6,641
Contract termination costs | ​ | ​ | 5,777 | ​ | ​ | — | ​ | ​ | 5,777
Total | ​ | $ | 7,737 | ​ | $ | 4,681 | ​ | $ | 12,418
Schedule of assets and liabilities of the Company measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | Significant Other
​ | ​ | Quoted Prices in | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Active Markets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
Description | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | Total
Short term investments | ​ | $ | 300 | ​ | $ | — | ​ | $ | — | ​ | $ | 300
Employee benefit plan investments | ​ | ​ | 2,768 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,768
Interest rate swap | ​ | ​ | — | ​ | ​ | (723) | ​ | ​ | — | ​ | ​ | (723)
Warrants on Alaska Communications redeemable common units | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (249) | ​ | ​ | (249)
Total assets and liabilities measured at fair value | ​ | $ | 3,068 | ​ | $ | (723) | ​ | $ | (249) | ​ | $ | 2,096
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
| ​ | Significant Other
​ | ​ | Quoted Prices in | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Active Markets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
Description | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | Total
Short term investments | ​ | $ | 300 | ​ | $ | — | ​ | $ | — | ​ | $ | 300
Other investments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,197 | ​ | ​ | 1,197
Employee benefit plan investments | ​ | ​ | 3,014 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,014
Interest rate swap | ​ | ​ | — | ​ | ​ | (1,750) | ​ | ​ | — | ​ | ​ | (1,750)
Alaska Communications redeemable common units | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (11,063) | ​ | ​ | (11,063)
Alloy redeemable common units (1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (14,760) | ​ | ​ | (14,760)
Warrants on Alaska Communications redeemable common units | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (249) | ​ | ​ | (249)
Total assets and liabilities measured at fair value | ​ | $ | 3,314 | ​ | $ | (1,750) | ​ | $ | (24,875) | ​ | $ | (23,311)
| (1) | Represents redeemable common units in Alloy, Inc. (“Alloy”), the parent company of the Company’s operations in the western United States.
Schedule of investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Investments Without a Readily Determinable Fair Value | ​ | Fair Value Investments | ​ | Equity Investments | ​ | Total
Balance, December 31, 2021 | $ | 17,820 | ​ | $ | 1,925 | ​ | $ | 28,699 | ​ | $ | 48,444
Sale of Investments (1) | ​ | — | ​ | ​ | — | ​ | ​ | (13,212) | ​ | ​ | (13,212)
Income (Loss) recognized | ​ | — | ​ | ​ | 435 | ​ | ​ | (2,234) | ​ | ​ | (1,799)
Contributions / (distributions) | ​ | — | ​ | ​ | (744) | ​ | ​ | 2,750 | ​ | ​ | 2,006
Foreign currency loss | ​ | — | ​ | ​ | — | ​ | ​ | (2,040) | ​ | ​ | (2,040)
Gain recognized | ​ | 4,770 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,770
Balance, December 31, 2022 | $ | 22,590 | ​ | $ | 1,616 | ​ | $ | 13,963 | ​ | $ | 38,169
Income recognized | ​ | 2,431 | ​ | ​ | 316 | ​ | ​ | 93 | ​ | ​ | 2,840
Contributions / (distributions) | ​ | 425 | ​ | ​ | (735) | ​ | ​ | 630 | ​ | ​ | 320
Foreign currency loss | ​ | — | ​ | ​ | — | ​ | ​ | 1,578 | ​ | ​ | 1,578
Transfers | ​ | 16,264 | ​ | ​ | — | ​ | ​ | (16,264) | ​ | ​ | —
Balance, December 31, 2023 | $ | 41,710 | ​ | $ | 1,197 | ​ | $ | — | ​ | $ | 42,907
Sale of Investments | ​ | — | ​ | ​ | (790) | ​ | ​ | — | ​ | ​ | (790)
Income recognized | ​ | 246 | ​ | ​ | 195 | ​ | ​ | — | ​ | ​ | 441
Distributions | ​ | — | ​ | ​ | (602) | ​ | ​ | — | ​ | ​ | (602)
Balance, December 31, 2024 | $ | 41,956 | ​ | $ | — | ​ | $ | — | ​ | $ | 41,956
| (1) | During 2022, the Company sold an investment previously accounted for using the equity method for $15.7 million of cash. The investment had a book value of $13.2 and the Company recognized a gain of $2.5 million on the transaction.
Schedule of computation of basic and diluted earnings per share | The following table reconciles the numerator and denominator in the computations of basic and diluted earnings per share (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year ended December 31,
​ | 2024 | ​ | 2023 | ​ | 2022
Numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net loss attributable to ATN International, Inc. stockholders- Basic | ​ | (26,429) | ​ | ​ | (14,538) | ​ | ​ | (5,645)
Less: Preferred dividends | ​ | (5,610) | ​ | ​ | (4,942) | ​ | ​ | (4,856)
Net loss attributable to ATN International, Inc. common stockholders- Diluted | $ | (32,039) | ​ | $ | (19,480) | ​ | $ | (10,501)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average shares outstanding- Basic | ​ | 15,229 | ​ | ​ | 15,595 | ​ | ​ | 15,751
Weighted-average shares outstanding- Diluted | ​ | 15,229 | ​ | ​ | 15,595 | ​ | ​ | 15,751
Schedule of rollforward activity related to the Company's redeemable noncontrolling interests | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Redeemable Preferred Units | ​ | Redeemable Common Units | ​ | Total Redeemable Noncontrolling Interests
Balance, December 31, 2023 | $ | 60,094 | ​ | $ | 25,823 | ​ | $ | 85,917
Accrued preferred dividend | ​ | 5,610 | ​ | ​ | — | ​ | ​ | 5,610
Allocated net loss | ​ | — | ​ | ​ | (17,674) | ​ | ​ | (17,674)
Change in fair value | ​ | — | ​ | ​ | 2,450 | ​ | ​ | 2,450
Balance, December 31, 2024 | $ | 65,704 | ​ | $ | 10,599 | ​ | $ | 76,303
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Redeemable Preferred Units | ​ | Redeemable Common Units | ​ | Total Redeemable Noncontrolling Interests
Balance, December 31, 2022 | $ | 55,152 | ​ | $ | 37,317 | ​ | $ | 92,469
Accrued preferred dividend | ​ | 4,942 | ​ | ​ | — | ​ | ​ | 4,942
Allocated net loss | ​ | — | ​ | ​ | (10,972) | ​ | ​ | (10,972)
Change in fair value | ​ | — | ​ | ​ | (522) | ​ | ​ | (522)
Balance, December 31, 2023 | $ | 60,094 | ​ | $ | 25,823 | ​ | $ | 85,917

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