CONSOLIDATED INCOME STATEMENTS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
REVENUE:
Total revenue	$ 481,193	$ 457,003	$ 355,369
OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated):
Termination and access fees	107,520	111,491	77,806
Engineering and operations	74,614	60,414	39,582
Sales, marketing and customer service	35,184	30,253	23,898
Equipment expense	13,104	14,951	14,803
General and administrative	102,134	91,905	59,436
Transaction-related charges	1,009	16,279	7,182
Restructuring charges	1,169	1,785
Depreciation and amortization	86,934	75,980	56,890
Impairment of long-lived assets		11,425
Bargain purchase gain		(7,304)
(Gain) loss on disposition of long-lived assets	101	27	(2,823)
Loss on damaged assets and other hurricane related charges, net of insurance recovery	3,956
Total operating expenses	425,725	407,206	276,774
Income from operations	55,468	49,797	78,595
OTHER INCOME (EXPENSE)
Interest income	1,613	1,239	588
Interest expense	(8,838)	(5,362)	(3,180)
Loss on deconsolidation of subsidiary	(529)		(19,937)
Other income (expense)	(161)	(300)	135
Other expense, net	(7,915)	(4,423)	(22,394)
INCOME BEFORE INCOME TAXES	47,553	45,374	56,201
Income tax (benefit) provisions	(1,341)	21,160	24,137
INCOME FROM CONTINUING OPERATIONS	48,894	24,214	32,064
INCOME FROM DISCONTINUED OPERATIONS:
Income from discontinued operations, net of tax			1,092
NET INCOME	48,894	24,214	33,156
Net income attributable to non-controlling interests, net of tax expense of $1.0 million, $1.3 million, and $1.6 million, respectively.	(17,406)	(12,113)	(16,216)
NET INCOME ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS	$ 31,488	$ 12,101	$ 16,940
NET INCOME PER WEIGHTED AVERAGE BASIC SHARE ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS:
Continuing operations (in dollars per share)	$ 1.95	$ 0.75	$ 0.99
Discontinued operations (in dollars per share)			0.07
Total (in dollars per share)	1.95	0.75	1.06
NET INCOME PER WEIGHTED AVERAGE DILUTED SHARE ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS:
Continuing operations (in dollars per share)	1.94	0.75	0.99
Discontinued operations (in dollars per share)			0.07
Total (in dollars per share)	$ 1.94	$ 0.75	$ 1.06
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	16,138	16,131	16,022
Diluted (in shares)	16,210	16,227	16,142
DIVIDENDS PER SHARE APPLICABLE TO COMMON STOCK (in dollars per share)	$ 1.02	$ 1.32	$ 1.22
Wireless
REVENUE:
Total revenue	$ 222,040	$ 228,798	$ 237,042
Wireline
REVENUE:
Total revenue	225,763	188,019	86,485
Renewable Energy
REVENUE:
Total revenue	20,467	21,608	21,040
Equipment and other
REVENUE:
Total revenue	$ 12,923	$ 18,578	$ 10,802