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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 2020 | ​ | $ | (570) | ​ | $ | 997 | ​ | $ | (149) | ​ | $ | 278 | ​
Unrecognized actuarial gain, net of tax of $(0.1) million | ​ |  | 5,014 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,014 | ​
Foreign currency translation adjustment | ​ |  | — | ​ | ​ | (689) | ​ | ​ | — | ​ | ​ | (689) | ​
Interest rate swap | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 170 | ​ | ​ | 170 | ​
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 | ​
Schedule of assets and liabilities of the Company measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | Significant Other
​ | ​ | Quoted Prices in | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Active Markets | ​ | Inputs | ​ | ​ | ​
Description | ​ | (Level 1) | ​ | (Level 3) | ​ | Total
Short term investments | ​ | $ | 300 | ​ | $ | — | ​ | $ | 300
Other investments | ​ | ​ | — | ​ | ​ | 1,197 | ​ | ​ | 1,197
Employee benefit plan investments | ​ | ​ | 3,014 | ​ | ​ | — | ​ | ​ | 3,014
Alaska Communications redeemable common units | ​ | ​ | — | ​ | ​ | (11,063) | ​ | ​ | (11,063)
Alloy redeemable common units | ​ | ​ | — | ​ | ​ | (14,760) | ​ | ​ | (14,760)
Warrants on Alaska Communications redeemable common units | ​ | ​ | — | ​ | ​ | (249) | ​ | ​ | (249)
Total assets and liabilities measured at fair value | ​ | $ | 3,314 | ​ | $ | (24,875) | ​ | $ | (21,561)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
| ​ | Significant Other
​ | ​ | Quoted Prices in | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Active Markets | ​ | Inputs | ​ | ​ | ​
Description | ​ | (Level 1) | ​ | (Level 3) | ​ | Total
Short term investments | ​ | $ | 300 | ​ | $ | — | ​ | $ | 300
Other investments | ​ | ​ | — | ​ | ​ | 1,616 | ​ | ​ | 1,616
Alaska Communications redeemable common units | ​ | ​ | — | ​ | ​ | (22,557) | ​ | ​ | (22,557)
Alloy redeemable common units | ​ | ​ | — | ​ | ​ | (14,760) | ​ | ​ | (14,760)
Warrants on Alaska Communications redeemable common units | ​ | ​ | — | ​ | ​ | (654) | ​ | ​ | (654)
Total assets and liabilities measured at fair value | ​ | $ | 300 | ​ | $ | (36,355) | ​ | $ | (36,055)
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 (Loss) 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
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,
​ | 2023 | ​ | 2022 | ​ | 2021
Numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net loss attributable to ATN International, Inc. stockholders- Basic | ​ | (14,538) | ​ | ​ | (5,645) | ​ | ​ | (22,108)
Less: Preferred dividends | ​ | (4,942) | ​ | ​ | (4,856) | ​ | ​ | (1,962)
Net Loss attributable to ATN International, Inc. common stockholders- Diluted | $ | (19,480) | ​ | $ | (10,501) | ​ | $ | (24,070)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average shares outstanding- Basic | ​ | 15,595 | ​ | ​ | 15,751 | ​ | ​ | 15,867
Weighted-average shares outstanding- Diluted | ​ | 15,595 | ​ | ​ | 15,751 | ​ | ​ | 15,867
Schedule of Restructuring expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | US | ​ | ​ | International | ​ | ​ | ​
​ | ​ | ​ | Telecom | ​ | ​ | Telecom | ​ | ​ | Total
Employee termination benefits | ​ | $ | 1,960 | ​ | $ | 3,491 | ​ | $ | 5,451
Contract termination costs | ​ | ​ | 5,777 | ​ | ​ | — | ​ | ​ | 5,777
Total | ​ | $ | 7,737 | ​ | $ | 3,491 | ​ | $ | 11,228
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, 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Redeemable Preferred Units | ​ | Redeemable Common Units | ​ | Total Redeemable Noncontrolling Interests
Balance, December 31, 2021 | $ | 50,296 | ​ | $ | 22,640 | ​ | $ | 72,936
Issuance of 591 common units | ​ | — | ​ | ​ | 14,760 | ​ | ​ | 14,760
Accrued preferred dividend | ​ | 4,856 | ​ | ​ | — | ​ | ​ | 4,856
Allocated net loss | ​ | — | ​ | ​ | (4,317) | ​ | ​ | (4,317)
Change in fair value | ​ | — | ​ | ​ | 4,234 | ​ | ​ | 4,234
Balance, December 31, 2022 | $ | 55,152 | ​ | $ | 37,317 | ​ | $ | 92,469

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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