SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

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