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
Purchase of shares of common stock	(4,187)		(4,187)					(4,187)
Stock-based compensation	2,614			2,614			107	2,721
Dividends declared on common stock	(5,440)				(5,440)		(5,553)	(10,993)
Repurchase of non-controlling interests	(1,300)			(1,300)			(2,611)	(3,911)
Comprehensive income:
Net income (loss)	3,733				3,733		7,009	10,742
Other comprehensive income (loss)	(2,812)					(2,812)		(2,812)
Comprehensive income	921						7,009	7,930
Balance, end of period at Jun. 30, 2020	668,730	172	(55,316)	189,785	540,183	(6,094)	128,913	797,643
Balance, beginning of period at Mar. 31, 2020	665,758	172	(54,358)	189,667	538,161	(7,884)	127,321	793,079
Increase (Decrease) in Stockholders' Equity
Purchase of shares of common stock	(958)		(958)					(958)
Stock-based compensation	1,418			1,418			131	1,549
Dividends declared on common stock	(2,724)				(2,724)		(1,321)	(4,045)
Repurchase of non-controlling interests	(1,300)			(1,300)			(836)	(2,136)
Comprehensive income:
Net income (loss)	4,746				4,746		3,618	8,364
Other comprehensive income (loss)	1,790					1,790		1,790
Comprehensive income	6,536						3,618	10,154
Balance, end of period at Jun. 30, 2020	668,730	172	(55,316)	189,785	540,183	(6,094)	128,913	797,643
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	(3,932)		(3,932)					(3,932)
Stock-based compensation	3,413			3,413			98	3,511
Dividends declared on common stock	(5,416)				(5,416)		(2,488)	(7,904)
Repurchase of non-controlling interests	(2,161)			(2,161)			(10,208)	(12,369)
Investments made by minority shareholders in consolidated affiliates							329	329
Comprehensive income:
Net income (loss)	4,723				4,723		2,842	7,565
Other comprehensive income (loss)	(350)					(350)		(350)
Comprehensive income	4,373						2,842	7,215
Balance, end of period at Jun. 30, 2021	641,926	172	(63,388)	189,006	516,208	(72)	99,260	741,186
Balance, beginning of period at Mar. 31, 2021	642,591	172	(61,677)	186,930	516,897	269	99,678	742,269
Increase (Decrease) in Stockholders' Equity
Purchase of shares of common stock	(1,711)		(1,711)					(1,711)
Stock-based compensation	2,150			2,150			25	2,175
Dividends declared on common stock	(2,708)				(2,708)		(958)	(3,666)
Repurchase of non-controlling interests	(74)			(74)			(1,085)	(1,159)
Investments made by minority shareholders in consolidated affiliates							329	329
Comprehensive income:
Net income (loss)	2,019				2,019		1,271	3,290
Other comprehensive income (loss)	(341)					(341)		(341)
Comprehensive income	1,678						1,271	2,949
Balance, end of period at Jun. 30, 2021	$ 641,926	$ 172	$ (63,388)	$ 189,006	$ 516,208	$ (72)	$ 99,260	$ 741,186