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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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 income:
Foreign currency translation adjustment									(4,390)	1,265	(687)
Reclassifications of gains on sale of marketable securities to net income										(1,044)
Unrealized gain on securities									78	440	868
Projected pension benefit obligation, net of tax expense of $0.6 million, $0.7 million and $0.7 million									(840)	1,357	5,251
Other comprehensive income (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

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