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EQUITY (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stockholders' equity        
Equity, beginning of period     $ 830,223 $ 809,169
Stock-based compensation     3,679 3,764
Comprehensive income:        
Net income $ 10,780 $ 10,909 8,477 22,494
Projected pension benefit obligation       513
Unrealized gain (loss) on securities 42 (90) 181 (130)
Reclassifications of gains on sale of marketable securities to net income   (755)   (1,044)
Foreign currency translation adjustment (2,551) 302 (3,583) 2,232
Comprehensive income 8,271 10,366 5,075 24,065
Issuance of common stock upon exercise of stock options     498 401
Dividends declared on common stock     (5,407) (10,951)
Distributions to non-controlling interests     (12,975) (3,491)
Investments made by non-controlling interests       123
Loss on deconsolidation of subsidiary       529
Repurchase of non-controlling interests     (61) (955)
Purchase of treasury stock     (4,158) (2,314)
Equity, end of period 819,509 820,450 819,509 820,450
ASU 2016-09        
Comprehensive income:        
Change in accounting method- adoption   110   110
ASU 2014-09        
Comprehensive income:        
Change in accounting method- adoption 2,635   2,635  
Total ATNI Stockholders' Equity        
Stockholders' equity        
Equity, beginning of period     688,727 677,055
Stock-based compensation     3,679 3,764
Comprehensive income:        
Net income     1,660 12,743
Projected pension benefit obligation       513
Unrealized gain (loss) on securities     181 (130)
Reclassifications of gains on sale of marketable securities to net income       (1,044)
Foreign currency translation adjustment     (3,583) 2,232
Comprehensive income     (1,742) 14,314
Issuance of common stock upon exercise of stock options     498 401
Dividends declared on common stock     (5,407) (10,951)
Repurchase of non-controlling interests       (670)
Purchase of treasury stock     (4,158) (2,314)
Equity, end of period 683,085 681,709 683,085 681,709
Total ATNI Stockholders' Equity | ASU 2016-09        
Comprehensive income:        
Change in accounting method- adoption   110   110
Total ATNI Stockholders' Equity | ASU 2014-09        
Comprehensive income:        
Change in accounting method- adoption 1,488   1,488  
Non-Controlling Interests        
Stockholders' equity        
Equity, beginning of period     141,496 132,114
Comprehensive income:        
Net income     6,817 9,751
Comprehensive income     6,817 9,751
Distributions to non-controlling interests     (12,975) (3,491)
Investments made by non-controlling interests       123
Loss on deconsolidation of subsidiary       529
Repurchase of non-controlling interests     (61) (285)
Equity, end of period 136,424 $ 138,741 136,424 $ 138,741
Non-Controlling Interests | ASU 2014-09        
Comprehensive income:        
Change in accounting method- adoption $ 1,147   $ 1,147