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FIXED ASSETS (Details) (USD $) | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014
Fixed Assets |  |  |  |
Total plant in service | $ 719,435,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress | $ 561,251,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress |  | 719,435,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress
Total property, plant, and equipment in service | 763,417,000 us-gaap_PropertyPlantAndEquipmentGross | 606,912,000 us-gaap_PropertyPlantAndEquipmentGross |  | 763,417,000 us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation | (393,835,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (352,280,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |  | (393,835,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net fixed assets | 369,582,000 us-gaap_PropertyPlantAndEquipmentNet | 254,632,000 us-gaap_PropertyPlantAndEquipmentNet |  | 369,582,000 us-gaap_PropertyPlantAndEquipmentNet
Depreciation and amortization | 50,300,000 us-gaap_DepreciationAndAmortization | 48,300,000 us-gaap_DepreciationAndAmortization | 50,000,000 us-gaap_DepreciationAndAmortization |
Capital expenditures offset by grants | 2,300,000 atni_CapitalExpendituresOffsetByGrants | 31,600,000 atni_CapitalExpendituresOffsetByGrants | 30,600,000 atni_CapitalExpendituresOffsetByGrants |
Minimum |  |  |  |
Fixed Assets |  |  |  |
Useful Life | 3 years |  |  |
Maximum |  |  |  |
Fixed Assets |  |  |  |
Useful Life | 39 years |  |  |
Telecommunications equipment and towers |  |  |  |
Fixed Assets |  |  |  |
Total plant in service | 514,814,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember | 471,265,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  | 514,814,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember
Telecommunications equipment and towers | Minimum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 5 years
Telecommunications equipment and towers | Maximum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 15 years
Solar assets |  |  |  |
Fixed Assets |  |  |  |
Total plant in service | 111,446,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = atni_SolarAssetsMember |  |  | 111,446,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = atni_SolarAssetsMember
Solar assets | Minimum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 20 years
Solar assets | Maximum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 23 years
Office and computer equipment |  |  |  |
Fixed Assets |  |  |  |
Total plant in service | 46,757,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = atni_OfficeAndComputerEquipmentMember | 46,680,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = atni_OfficeAndComputerEquipmentMember |  | 46,757,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = atni_OfficeAndComputerEquipmentMember
Office and computer equipment | Minimum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 3 years
Office and computer equipment | Maximum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 10 years
Buildings |  |  |  |
Fixed Assets |  |  |  |
Total plant in service | 18,079,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember | 18,002,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember |  | 18,079,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember
Buildings | Minimum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 15 years
Buildings | Maximum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 39 years
Transportation vehicles |  |  |  |
Fixed Assets |  |  |  |
Total plant in service | 7,589,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember | 6,984,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |  | 7,589,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember
Transportation vehicles | Minimum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 3 years
Transportation vehicles | Maximum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 10 years
Leasehold improvements |  |  |  |
Fixed Assets |  |  |  |
Total plant in service | 11,494,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember | 11,380,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |  | 11,494,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Land |  |  |  |
Fixed Assets |  |  |  |
Total plant in service | 1,146,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember | 1,162,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |  | 1,146,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Furniture and fixtures |  |  |  |
Fixed Assets |  |  |  |
Total plant in service | 8,110,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember | 5,778,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember |  | 8,110,000 atni_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Furniture and fixtures | Minimum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 5 years
Furniture and fixtures | Maximum |  |  |  |
Fixed Assets |  |  |  |
Useful Life |  |  |  | 10 years
Construction in progress |  |  |  |
Fixed Assets |  |  |  |
Total property, plant, and equipment in service | $ 43,982,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember | $ 45,661,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |  | 43,982,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember

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