CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ (708)	$ 1,967	$ 34,872
Other comprehensive income (loss):
Foreign currency translation adjustment	37	(1,041)	(4,390)
Unrealized gain (loss) on derivatives	(101)	(187)	78
Reclassification of foreign currency losses on assets held for sale	6,036
Projected pension and postretirement benefit obligation, net of tax expense of $0.1 million, $0.1 million and $0.6 million, respectively	(2,412)	(445)	(840)
Other comprehensive income (loss), net of tax	3,560	(1,673)	(5,152)
Comprehensive income	2,852	294	29,720
Less: Comprehensive income attributable to non-controlling interests	(13,414)	(12,773)	(15,057)
Comprehensive income (loss) attributable to ATN International, Inc.	$ (10,562)	$ (12,479)	$ 14,663