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ACQUISITIONS AND DISPOSITIONS - Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 01, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Pro forma |  |  |
Acquisitions |  |  |
Impairment charges |  | $ 5,400 | $ 168,700
Pro Forma |  |  |
Revenue |  | 535,628 | 546,589
Net income (loss) attributable to ATN International, Inc. Stockholders |  | $ 14,660 | $ (97,102)
Earnings per share: Basic (in dollars per share) |  | $ 0.91 | $ (6.06)
Earnings per share: Diluted (in dollars per share) |  | $ 0.90 | $ (6.02)
As reported |  |  |
Pro Forma |  |  |
Revenue |  | $ 457,003 | $ 355,369
Net income (loss) attributable to ATN International, Inc. Stockholders |  | $ 12,101 | $ 16,940
Earnings per share: Basic (in dollars per share) |  | $ 0.75 | $ 1.06
Earnings per share: Diluted (in dollars per share) |  | $ 0.75 | $ 1.05
One Communications (formerly KeyTech) |  |  |
Acquisitions |  |  |
Retirement of debt |  | $ 24,700 |
One Communications (formerly KeyTech) | Pro forma |  |  |
Acquisitions |  |  |
Impairment charges |  | 4,300 | $ 85,600
Innovative |  |  |
Acquisitions |  |  |
Retirement of debt |  | 185,800 |
Addition of debt | $ 60,000 |  |
Innovative | Pro forma |  |  |
Acquisitions |  |  |
Impairment charges |  | $ 1,100 | $ 83,100

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