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Revenue Recognition - Impacts of adoption in the current period - CIS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (2,303)	$ 11,584
Other comprehensive loss, net of tax	(893)	2,113
Comprehensive income (loss)	(3,196)	13,697
Less: Comprehensive income attributable to non-controlling interests	(3,252)	(4,725)
Comprehensive income (loss) attributable to ATN International, Inc.	(6,448)	$ 8,972
ASU 2014-09 | Change
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	418
Comprehensive income (loss)	418
Less: Comprehensive income attributable to non-controlling interests	(181)
Comprehensive income (loss) attributable to ATN International, Inc.	237
ASU 2014-09 | Under previous guidance
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	(2,721)
Other comprehensive loss, net of tax	(893)
Comprehensive income (loss)	(3,614)
Less: Comprehensive income attributable to non-controlling interests	(3,071)
Comprehensive income (loss) attributable to ATN International, Inc.	$ (6,685)

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