CONSOLIDATED INCOME STATEMENTS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
REVENUE:
Total revenue	$ 602,707	$ 455,444	$ 438,722
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Selling, general and administrative	188,283	139,011	139,264
Transaction-related charges	10,221	1,641	244
Depreciation and amortization	102,731	86,504	86,963
Amortization of intangibles from acquisitions	7,775	1,807	2,162
Goodwill impairment	20,587	0	3,279
Loss on disposition of long-lived assets	2,759	21,572	2,841
Total operating expenses	617,733	446,264	425,345
Income (loss) from operations	(15,026)	9,180	13,377
OTHER INCOME (EXPENSE)
Interest income	132	421	2,263
Interest expense	(9,614)	(5,347)	(5,010)
Other income (expense)	1,821	(4,161)	(4,558)
Other income (expense), net	(7,661)	(9,087)	(7,305)
INCOME (LOSS) BEFORE INCOME TAXES	(22,687)	93	6,072
Income tax provision (benefit)	(1,878)	801	4,105
NET INCOME (LOSS)	(20,809)	(708)	1,967
Net income attributable to noncontrolling interests, net of tax expense (benefit) of $(0.4) million, $1.1 million, and $1.3 million, respectively.	(1,299)	(13,414)	(12,773)
NET LOSS ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS	$ (22,108)	$ (14,122)	$ (10,806)
NET LOSS PER WEIGHTED AVERAGE SHARE ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS:
Basic (in dollars per share)	$ (1.52)	$ (0.89)	$ (0.68)
Diluted (in dollars per share)	$ (1.52)	$ (0.89)	$ (0.68)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	15,867	15,923	15,983
Diluted (in shares)	15,867	15,923	15,983
DIVIDENDS PER SHARE APPLICABLE TO COMMON STOCK	$ 0.68	$ 0.68	$ 0.68
Communication services
REVENUE:
Total revenue	$ 549,620	$ 433,509	$ 428,108
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Cost of services	249,322	185,113	190,592
Construction
REVENUE:
Total revenue	35,889	10,913
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Cost of services	36,055	10,616
Other revenue
REVENUE:
Total revenue	$ 17,198	$ 11,022	$ 10,614