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Revenue Recognition - Impacts of adoption in the current period - IS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	$ 117,788		$ 222,263
Sales, marketing and customer service	8,413	$ 8,729	16,974	$ 17,765
Total operating expenses	102,035	107,442	202,301	217,804
Income from operations	15,753	15,803	19,962	33,556
Income before taxes	12,868	13,505	14,485	28,218
Income tax provisions	2,088	2,596	6,008	5,724
Net income	10,780	10,909	8,477	22,494
Net income attributable to non-controlling interests	(3,564)	(5,026)	(6,816)	(9,751)
Net income attributable to ATN International, Inc. stockholders	7,216	$ 5,883	1,661	$ 12,743
ASU 2014-09 | Change
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	204		337
Sales, marketing and customer service	(240)		(618)
Total operating expenses	(240)		(618)
Income from operations	444		955
Income before taxes	444		955
Income tax provisions	49		142
Net income	395		813
Net income attributable to non-controlling interests	(154)		(335)
Net income attributable to ATN International, Inc. stockholders	241		478
ASU 2014-09 | Under previous guidance
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	117,584		221,926
Sales, marketing and customer service	8,653		17,592
Total operating expenses	102,275		202,919
Income from operations	15,309		19,007
Income before taxes	12,424		13,530
Income tax provisions	2,039		5,866
Net income	10,385		7,664
Net income attributable to non-controlling interests	(3,410)		(6,481)
Net income attributable to ATN International, Inc. stockholders	6,975		1,183
Wireless
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	50,496		101,043
Wireless | ASU 2014-09 | Change
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	204		337
Wireless | ASU 2014-09 | Under previous guidance
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	$ 50,292		$ 100,706

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