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 quarter ended March 31,2018	498			498				498
Purchase of common stock (28,242 and 41,827 shares) upon exercise of stock options for the quarter ended March 31, 2019 and 2018 respectively)	(2,538)		(2,538)					(2,538)
Stock-based compensation	1,576			1,576				1,576
Dividends declared on common stock	(2,696)				(2,696)		(12,484)	(15,180)
Repurchase of non-controlling interests							(3)	(3)
Comprehensive income:
Net income (loss)	(5,555)				(5,555)		3,252	(2,303)
Other comprehensive loss	(893)					(893)		(893)
Comprehensive income (loss)	(6,448)						3,252	(3,196)
Balance, end of period at Mar. 31, 2018	680,607	170	(38,648)	170,047	546,388	2,650	133,408	814,015
Increase (Decrease) in Stockholders' Equity
Cumulative effect adjustment due to adoption of new accounting	1,488				1,691	(203)	1,147	2,635
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 (28,242 and 41,827 shares) upon exercise of stock options for the quarter ended March 31, 2019 and 2018 respectively)	(1,569)		(1,569)					(1,569)
Stock-based compensation	1,301			1,301				1,301
Dividends declared on common stock	(2,693)				(2,693)		(1,553)	(4,246)
Repurchase of non-controlling interests							(225)	(225)
Investments made by minority shareholders in consolidated affiliates							488	488
Comprehensive income:
Net income (loss)	(1,581)				(1,581)		2,316	735
Other comprehensive loss	176					176		176
Comprehensive income (loss)	(1,405)						2,316	911
Balance, end of period at Mar. 31, 2019	$ 691,021	$ 172	$ (50,116)	$ 183,079	$ 559,319	$ (1,433)	$ 128,963	$ 819,984