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EQUITY (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stockholders' equity        
Equity, beginning of period     $ 809,169 $ 761,724
Stock-based compensation     5,415 5,034
Comprehensive income:        
Net income $ (20,976) $ 11,694 1,519 20,606
Projected pension benefit obligation     513  
Unrealized gain (loss) on securities 67   (65)  
Reclassifications of gains on sale of marketable securities to net income     (1,044)  
Foreign currency translation adjustment (1,311) (164) 921 (200)
Comprehensive income (loss) (22,220) 11,530 1,844 20,406
Issuance of common stock upon exercise of stock options     1,057 1,371
Dividends declared on common stock     (13,680) (15,838)
Distributions to non-controlling interests     (3,761) (7,828)
Investments made by non-controlling interests     123 22,409
Acquisition from non-controlling interest       (576)
Loss on deconsolidation of subsidiary     529  
Repurchase of non-controlling interests     (1,104) (7,045)
Purchase of treasury stock     (12,968) (4,755)
Equity, end of period 786,734 807,840 786,734 807,840
One Communications (formerly KeyTech)        
Comprehensive income:        
Acquisition       32,717
Viya (formerly Innovative)        
Comprehensive income:        
Acquisition       221
Accounting Standards Update 2016-09        
Comprehensive income:        
Change in accounting method- adoption of ASC 2016-09     110  
Total ATNI Stockholders' Equity        
Stockholders' equity        
Equity, beginning of period     677,055 680,299
Stock-based compensation     5,415 5,034
Comprehensive income:        
Net income     (12,016) 10,206
Projected pension benefit obligation     513  
Unrealized gain (loss) on securities     (65)  
Reclassifications of gains on sale of marketable securities to net income     (1,044)  
Foreign currency translation adjustment     921 (200)
Comprehensive income (loss)     (11,691) 10,006
Issuance of common stock upon exercise of stock options     1,057 1,371
Dividends declared on common stock     (13,680) (15,838)
Acquisition from non-controlling interest       (306)
Repurchase of non-controlling interests     (670) (4,105)
Purchase of treasury stock     (12,968) (4,755)
Equity, end of period 644,628 671,706 644,628 671,706
Total ATNI Stockholders' Equity | Accounting Standards Update 2016-09        
Comprehensive income:        
Change in accounting method- adoption of ASC 2016-09     110  
Non-Controlling Interests        
Stockholders' equity        
Equity, beginning of period     132,114 81,425
Comprehensive income:        
Net income     13,535 10,400
Comprehensive income (loss)     13,535 10,400
Distributions to non-controlling interests     (3,761) (7,828)
Investments made by non-controlling interests     123 22,409
Acquisition from non-controlling interest       (270)
Loss on deconsolidation of subsidiary     529  
Repurchase of non-controlling interests     (434) (2,940)
Equity, end of period $ 142,106 $ 136,134 $ 142,106 136,134
Non-controlling interest's cash contribution to subsidiary       21,700
Non-Controlling Interests | One Communications (formerly KeyTech)        
Comprehensive income:        
Acquisition       32,717
Non-Controlling Interests | Viya (formerly Innovative)        
Comprehensive income:        
Acquisition       $ 221