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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2019 | ​ | $ | 1,842 | ​ | $ | (5,076) | ​ | $ | (48) | ​ | $ | (3,282) | ​
Unrecognized actuarial loss, net of tax of $0.1 million | ​ |  | (2,412) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (2,412) | ​
Foreign currency translation adjustment | ​ |  | — | ​ | ​ | 37 | ​ | ​ | — | ​ | ​ | 37 | ​
Interest rate swap | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (101) | ​ | ​ | (101) | ​
Reclassification of foreign currency losses on assets held for sale | ​ | ​ | — | ​ | ​ | 6,036 | ​ | ​ | — | ​ | ​ | 6,036 | ​
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 | ​
Schedule of assets and liabilities of the Company measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
| ​ | Significant Other
​ | ​ | Quoted Prices in | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Active Markets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
Description | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | Total
Money market funds | ​ | $ | 3,301 | ​ | $ | — | ​ | $ | — | ​ | $ | 3,301
Short term investments | ​ | ​ | 300 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 300
Other investments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,925 | ​ | ​ | 1,925
Alaska Communications redeemable common units | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (22,640) | ​ | ​ | (22,640)
Warrants on Alaska Communications redeemable common units | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (559) | ​ | ​ | (559)
Interest rate swap | ​ | ​ | — | ​ | ​ | (894) | ​ | ​ | — | ​ | ​ | (894)
Total assets and liabilities measured at fair value | ​ | $ | 3,601 | ​ | $ | (894) | ​ | $ | (21,274) | ​ | $ | (18,567)
​
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
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,
​ | 2022 | ​ | 2021 | ​ | 2020
Numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net Loss | $ | (7,583) | ​ | $ | (20,809) | ​ | $ | (708)
Net (Income) Loss attributable to noncontrolling interests | ​ | 1,938 | ​ | ​ | (1,299) | ​ | ​ | (13,414)
Net Loss attributable to ATN International, Inc. stockholders- Basic | ​ | (5,645) | ​ | ​ | (22,108) | ​ | ​ | (14,122)
Less: Preferred dividends | ​ | (4,856) | ​ | ​ | (1,962) | ​ | ​ | -
Net Loss attributable to ATN International, Inc. common stockholders- Diluted | $ | (10,501) | ​ | $ | (24,070) | ​ | $ | (14,122)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average shares outstanding- Basic | ​ | 15,751 | ​ | ​ | 15,867 | ​ | ​ | 15,923
Effective of dilutive securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options, restricted stock units and performance stock units | ​ | — | ​ | ​ | — | ​ | ​ | —
Weighted-average shares outstanding- Diluted | ​ | 15,751 | ​ | ​ | 15,867 | ​ | ​ | 15,923
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, 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Redeemable Preferred Units | ​ | Redeemable Common Units | ​ | Total Redeemable Noncontrolling Interests
Balance, December 31, 2020 | $ | — | ​ | $ | — | ​ | $ | —
Issuance of 48,334 preferred units | ​ | 48,334 | ​ | ​ | — | ​ | ​ | 48,334
Issuance of 23,199 common units | ​ | — | ​ | ​ | 22,640 | ​ | ​ | 22,640
Accrued preferred dividend | ​ | 1,962 | ​ | ​ | — | ​ | ​ | 1,962
Allocated net loss | ​ | — | ​ | ​ | (6,164) | ​ | ​ | (6,164)
Change in fair value | ​ | — | ​ | ​ | 6,164 | ​ | ​ | 6,164
Balance, December 31, 2021 | $ | 50,296 | ​ | $ | 22,640 | ​ | $ | 72,936

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