CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
REVENUE:
Total Revenue	$ 111,739	$ 115,616	$ 331,743	$ 326,637
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Termination and access fees	26,979	27,622	83,562	83,440
Engineering and operations	18,127	20,095	53,983	58,234
Sales, marketing and customer service	9,344	9,785	28,220	29,048
General and administrative	25,735	25,110	75,413	75,518
Transaction-related charges	31	21	147	89
Depreciation and amortization	21,580	22,603	66,089	64,870
(Gain) loss on disposition of long-lived assets	(4)	132	60	321
Total operating expenses	102,182	105,368	307,864	311,520
Income from operations	9,557	10,248	23,879	15,117
OTHER INCOME (EXPENSE)
Interest income	118	414	427	1,860
Interest expense	(1,361)	(1,298)	(4,091)	(3,843)
Other income (expense)	(2,031)	(2,686)	(4,341)	(2,755)
Other income (expense), net	(3,274)	(3,570)	(8,005)	(4,738)
INCOME BEFORE INCOME TAXES	6,283	6,678	15,874	10,379
Income tax provisions	92	1,834	(1,057)	2,774
NET INCOME	6,191	4,844	16,931	7,605
Net income attributable to non-controlling interests, net of tax expense of $0.2 million, $0.4 million, $0.8 million, $1.2 million, respectively.	(3,530)	(3,459)	(10,538)	(8,657)
NET INCOME (LOSS) ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS	$ 2,661	$ 1,385	$ 6,393	$ (1,052)
NET INCOME (LOSS) PER WEIGHTED AVERAGE SHARE ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS:
Basic (in dollars per share)	$ 0.17	$ 0.09	$ 0.40	$ (0.07)
Diluted (in dollars per share)	$ 0.17	$ 0.09	$ 0.40	$ (0.07)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	15,962	16,000	15,946	15,984
Diluted (in shares)	16,011	16,007	15,990	15,984
DIVIDENDS PER SHARE APPLICABLE TO COMMON STOCK (in dollars per share)	$ 0.17	$ 0.17	$ 0.51	$ 0.51
Communication services
REVENUE:
Total Revenue	$ 108,721	$ 112,840	$ 322,865	$ 318,473
Other
REVENUE:
Total Revenue	3,018	$ 2,776	8,878	$ 8,164
Construction costs
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Construction Costs	$ 390		$ 390