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ACQUISITIONS - Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2016 | May 03, 2016 | Apr. 07, 2016 | Apr. 07, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration Transferred |  | $ 41,563 |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 62,042 |  | $ 45,077
Pro forma |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  | 5,400 | $ 168,700 |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |
Revenue |  |  |  |  | $ 146,074 | 407,096 | 415,501 |
Net Income attributable to ATN International, Inc. Stockholders |  |  |  |  | $ 6,566 | $ 12,767 | $ (101,631) |
Earnings per share: Basic (in dollars per share) |  |  |  |  | $ 0.41 | $ 0.79 | $ (6.35) |
Earnings per share: Diluted (in dollars per share) |  |  |  |  | $ 0.41 | $ 0.79 | $ (6.30) |
As reported |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |
Revenue |  |  |  |  | $ 96,782 | $ 328,471 | $ 272,453 |
Net Income attributable to ATN International, Inc. Stockholders |  |  |  |  | $ 6,576 | $ 10,206 | $ 12,757 |
Earnings per share: Basic (in dollars per share) |  |  |  |  | $ 0.41 | $ 0.63 | $ 0.79 |
Earnings per share: Diluted (in dollars per share) |  |  |  |  | $ 0.41 | $ 0.63 | $ 0.79 |
Keytech |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Retirement of debt |  |  |  |  |  | $ 24,700 |  |
Consideration Transferred |  | 34,518 |  |  |  |  |  |
Consideration attributable to Fixed Assets |  | $ 100,892 |  |  |  |  |  |
Keytech | Pro forma |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  | 4,300 | $ 85,600 |
Innovative |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Retirement of debt |  |  |  |  |  | 185,500 |  |
Addition of debt |  |  |  |  |  | 60,000 |  |
Consideration Transferred | $ 112,301 |  |  |  |  |  |  |
Consideration attributable to Fixed Assets | 108,284 |  |  |  |  |  |  |
Goodwill | $ 20,586 |  |  |  |  |  |  |
Innovative | Pro forma |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  | $ 1,100 | $ 83,100 |
Vibrant Energy |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration Transferred |  |  |  | $ 6,193 |  |  |  |
Consideration attributable to Fixed Assets |  |  | $ 7,321 | 7,321 |  |  |  |
Goodwill |  |  | 3,279 | $ 3,279 |  |  |  |
Consideration paid |  |  | $ 3,500 |  |  |  |  |

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