CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
REVENUE:
Total revenue	$ 166,760	$ 111,739	$ 415,135	$ 331,743
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Selling, general and administrative	53,360	35,079	131,705	103,633
Transaction-related charges	5,696	31	7,823	147
Depreciation	28,875	21,157	68,693	64,705
Amortization of intangibles from acquisitions	3,480	423	4,324	1,384
(Gain) loss on disposition of long-lived assets	(256)	(4)	605	60
Total operating expenses	167,742	102,182	409,864	307,864
Income from operations	(982)	9,557	5,271	23,879
OTHER INCOME (EXPENSE)
Interest income	42	118	83	427
Interest expense	(3,438)	(1,361)	(5,723)	(4,091)
Other income (expense)	(385)	(2,031)	1,923	(4,341)
Other income (expense), net	(3,781)	(3,274)	(3,717)	(8,005)
INCOME (LOSS) BEFORE INCOME TAXES	(4,763)	6,283	1,554	15,874
Income tax provision (benefit)	(288)	92	(1,535)	(1,057)
NET INCOME (LOSS)	(4,475)	6,191	3,089	16,931
(Net income) loss attributable to noncontrolling interests, net of tax expense (benefit) of $(1.2) million, $0.2 million, $(0.8) million, and $0.8 million, respectively.	1,856	(3,530)	(986)	(10,538)
NET INCOME (LOSS) ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS	$ (2,619)	$ 2,661	$ 2,103	$ 6,393
NET INCOME (LOSS) PER WEIGHTED AVERAGE SHARE ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS:
Basic (in dollars per share)	$ (0.22)	$ 0.17	$ 0.08	$ 0.40
Diluted (in dollars per share)	$ (0.22)	$ 0.17	$ 0.08	$ 0.40
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	15,860	15,962	15,891	15,946
Diluted (in shares)	15,860	16,011	15,901	15,990
DIVIDENDS PER SHARE APPLICABLE TO COMMON STOCK	$ 0.17	$ 0.17	$ 0.51	$ 0.51
Communication services
REVENUE:
Total revenue	$ 155,298	$ 108,721	$ 378,897	$ 322,865
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Cost of services	70,732	45,106	168,717	137,545
Other
REVENUE:
Total revenue	11,462	3,018	36,238	8,878
Construction
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Cost of services	$ 5,855	$ 390	$ 27,997	$ 390

Other interest income (expense) pertaining to nonoperating.

No definition available.

Name:	atni_OtherInterestIncomeExpenseNonoperating
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274