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ACQUISITIONS AND DISPOSITIONS - Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2016 | May 03, 2016 | Sep. 30, 2016 | Sep. 30, 2016
One Communications (formerly KeyTech) |  |  |  |
Acquisition |  |  |  |
Retirement of debt |  | $ 24,700 |  |
Viya (formerly Innovative) |  |  |  |
Acquisition |  |  |  |
Retirement of debt | $ 185,800 |  |  |
Viya (formerly Innovative) | Term loans |  |  |  |
Acquisition |  |  |  |
Debt Instrument, Face Amount | $ 60,000 |  |  |
One Communications and Viya |  |  |  |
Pro Forma |  |  |  |
Revenue |  |  | $ 407,096 |
Net income (loss) attributable to ATN International, Inc. Stockholders |  |  | $ 12,768 |
Earnings per share: Basic (in dollars per share) |  |  | $ 0.79 |
Earnings per share: Diluted (in dollars per share) |  |  | $ 0.79 |
One Communications and Viya | As reported |  |  |  |
Pro Forma |  |  |  |
Revenue |  |  | $ 328,471 |
Net income (loss) attributable to ATN International, Inc. Stockholders |  |  | $ 10,206 |
Earnings per share: Basic (in dollars per share) |  |  | $ 0.63 |
Earnings per share: Diluted (in dollars per share) |  |  | $ 0.63 |
One Communications and Viya |  |  |  |
Acquisition |  |  |  |
Impairment charges |  |  |  | $ 5,400

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