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Revenue Recognition - Impacts of adoption in the current period - CIS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 5,485	$ 20,910	$ 10,780	$ (2,303)	$ 47,377	$ (20,976)	$ 10,909	$ 11,584	$ 34,872	$ 48,894	$ 24,214
Other comprehensive loss, net of tax									(5,152)	2,018	5,432
Comprehensive income									29,720	50,912	29,646
Less: Comprehensive income attributable to non-controlling interests									(15,057)	(17,406)	(12,113)
Comprehensive income attributable to ATN International, Inc.									14,663	$ 33,506	$ 17,533
ASU 2014-09 | Change
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income									1,699
Comprehensive income									1,699
Less: Comprehensive income attributable to non-controlling interests									(706)
Comprehensive income attributable to ATN International, Inc.									993
ASU 2014-09 | Under previous guidance
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income									33,173
Other comprehensive loss, net of tax									(5,152)
Comprehensive income									28,021
Less: Comprehensive income attributable to non-controlling interests									(14,351)
Comprehensive income attributable to ATN International, Inc.									$ 13,670

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