CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total ATNI Stockholders' Equity	Common Stock	Treasury Stock, at cost	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Non-Controlling Interests	Total
Balance, beginning of period at Dec. 31, 2019	$ 676,122	$ 172	$ (51,129)	$ 188,471	$ 541,890	$ (3,282)	$ 129,961	$ 806,083
Increase (Decrease) in Stockholders' Equity
Issuance of shares of common stock upon exercise of stock options	(3,229)		(3,229)					(3,229)
Stock-based compensation	1,196			1,196			(36)	1,160
Dividends declared on common stock	(2,715)				(2,715)			(2,715)
Distributions to non-controlling interests							(4,220)	(4,220)
Repurchase of non-controlling interests							(1,774)	(1,774)
Comprehensive income:
Net income (loss)	(1,014)				(1,014)		3,390	2,376
Other comprehensive income (loss)	(4,602)					(4,602)		(4,602)
Comprehensive income	(5,616)						3,390	(2,226)
Balance, end of period at Mar. 31, 2020	665,758	172	(54,358)	189,667	538,161	(7,884)	127,321	793,079
Balance, beginning of period at Dec. 31, 2020	645,649	172	(59,456)	187,754	516,901	278	108,687	754,336
Increase (Decrease) in Stockholders' Equity
Purchase of shares of common stock	(2,221)		(2,221)					(2,221)
Stock-based compensation	1,262			1,262			74	1,336
Dividends declared on common stock	(2,710)				(2,710)			(2,710)
Distributions to non-controlling interests							(1,530)	(1,530)
Repurchase of non-controlling interests	(2,086)			(2,086)			(9,123)	(11,209)
Comprehensive income:
Net income (loss)	2,706				2,706		1,570	4,276
Other comprehensive income (loss)	(9)					(9)		(9)
Comprehensive income	2,697						1,570	4,267
Balance, end of period at Mar. 31, 2021	$ 642,591	$ 172	$ (61,677)	$ 186,930	$ 516,897	$ 269	$ 99,678	$ 742,269