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, 2017	$ 688,727	$ 170	$ (36,110)	$ 167,973	$ 552,948	$ 3,746	$ 141,496	$ 830,223
Increase (Decrease) in Stockholders' Equity
Issuance of 12,500 shares of common stock upon exercise of stock options for the period ended June 30,2018	518			518				518
Purchase of common stock (28,393 and 72,922 shares) upon exercise of stock options for the period ended June 30, 2019 and 2018 respectively)	(4,158)		(4,158)					(4,158)
Stock-based compensation	3,679			3,679				3,679
Dividends declared on common stock	(5,428)				(5,428)		(12,974)	(18,402)
Repurchase of non-controlling interests							(62)	(62)
Comprehensive income:
Net income (loss)	1,661				1,661		6,816	8,477
Other comprehensive income (loss)	(3,402)					(3,402)		(3,402)
Comprehensive income	(1,741)						6,816	5,075
Balance, end of period at Jun. 30, 2018	683,085	170	(40,268)	172,170	550,872	141	136,424	819,509
Increase (Decrease) in Stockholders' Equity
Cumulative effect adjustment due to adoption of new accounting	1,488				1,691	(203)	1,148	2,636
Balance, beginning of period at Dec. 31, 2018	695,387	172	(48,547)	181,778	563,593	(1,609)	127,937	823,324
Increase (Decrease) in Stockholders' Equity
Purchase of common stock (28,393 and 72,922 shares) upon exercise of stock options for the period ended June 30, 2019 and 2018 respectively)	(1,578)		(1,578)					(1,578)
Stock-based compensation	3,334			3,334				3,334
Dividends declared on common stock	(5,351)				(5,351)		(3,901)	(9,252)
Repurchase of non-controlling interests							(864)	(864)
Investments made by minority shareholders in consolidated affiliates							488	488
Comprehensive income:
Net income (loss)	(2,436)				(2,436)		5,198	2,762
Other comprehensive income (loss)	327					327		327
Comprehensive income	(2,109)						5,198	3,089
Balance, end of period at Jun. 30, 2019	$ 689,683	$ 172	$ (50,125)	$ 185,112	$ 555,806	$ (1,282)	$ 128,858	$ 818,541