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LONG-TERM DEBT (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Dec. 19, 2014
Term loans assumed in Ahana acquisition |  |  |
Term loans assumed in Ahana acquisition | $ 37,394,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities | $ 38,877,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities |
Less: current portion | (6,150,000)us-gaap_LongTermDebtCurrent | (6,083,000)us-gaap_LongTermDebtCurrent |
Total long term debt | 31,244,000 us-gaap_LongTermDebtNoncurrent | 32,794,000 us-gaap_LongTermDebtNoncurrent |
Amended Credit Facility |  |  |
Term loans assumed in Ahana acquisition |  |  |
Borrowings | 0 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember | 0 us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember |
Revolving credit facility | Amended Credit Facility |  |  |
Term loans assumed in Ahana acquisition |  |  |
Maximum borrowing capacity |  |  | 225,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember
Revolving credit facility | Amended Credit Facility | LIBOR |  |  |
Term loans assumed in Ahana acquisition |  |  |
Description of variable rate basis | LIBOR |  |
Revolving credit facility | Amended Credit Facility | Base rate |  |  |
Term loans assumed in Ahana acquisition |  |  |
Description of variable rate basis | base rate |  |
Revolving credit facility | Amended Credit Facility | Minimum |  |  |
Term loans assumed in Ahana acquisition |  |  |
Commitment fee (as a percent) | 0.175%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Revolving credit facility | Amended Credit Facility | Minimum | LIBOR |  |  |
Term loans assumed in Ahana acquisition |  |  |
Basis spread on variable rate (as a percent) | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Revolving credit facility | Amended Credit Facility | Minimum | Base rate |  |  |
Term loans assumed in Ahana acquisition |  |  |
Basis spread on variable rate (as a percent) | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |
Revolving credit facility | Amended Credit Facility | Maximum |  |  |
Term loans assumed in Ahana acquisition |  |  |
Commitment fee (as a percent) | 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Revolving credit facility | Amended Credit Facility | Maximum | LIBOR |  |  |
Term loans assumed in Ahana acquisition |  |  |
Basis spread on variable rate (as a percent) | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
Revolving credit facility | Amended Credit Facility | Maximum | Base rate |  |  |
Term loans assumed in Ahana acquisition |  |  |
Basis spread on variable rate (as a percent) | 0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |
Swingline sub-facility | Amended Credit Facility |  |  |
Term loans assumed in Ahana acquisition |  |  |
Maximum borrowing capacity |  |  | 10,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = atni_SwinglineSubFacilityMember
Swingline sub-facility | Amended Credit Facility | Base rate |  |  |
Term loans assumed in Ahana acquisition |  |  |
Description of variable rate basis | Base rate |  |
Swingline sub-facility | Amended Credit Facility | One-week LIBOR |  |  |
Term loans assumed in Ahana acquisition |  |  |
Description of variable rate basis | one-week LIBOR |  |
Swingline sub-facility | Amended Credit Facility | One-month LIBOR |  |  |
Term loans assumed in Ahana acquisition |  |  |
Description of variable rate basis | one-month LIBOR |  |
Swingline sub-facility | Amended Credit Facility | Prime Rate |  |  |
Term loans assumed in Ahana acquisition |  |  |
Description of variable rate basis | Prime rate |  |
Swingline sub-facility | Amended Credit Facility | Federal Funds Effective Rate |  |  |
Term loans assumed in Ahana acquisition |  |  |
Description of variable rate basis | federal funds effective rate |  |
Basis spread on variable rate (as a percent) | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = atni_SwinglineSubFacilityMember / us-gaap_VariableRateAxis = us-gaap_FederalFundsEffectiveSwapRateMember |  |
Swingline sub-facility | Amended Credit Facility | Minimum | Base rate |  |  |
Term loans assumed in Ahana acquisition |  |  |
Basis spread on variable rate (as a percent) | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = atni_SwinglineSubFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |
Letter of credit sub-facility |  |  |
Term loans assumed in Ahana acquisition |  |  |
Outstanding letters of credit | 10,600,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember | 10,600,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember |
Letter of credit sub-facility | Universal Service Administrative Company |  |  |
Term loans assumed in Ahana acquisition |  |  |
Outstanding letters of credit | 10,600,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_UniversalServiceAdministrativeCompanyMember |  |
Letter of credit sub-facility | Amended Credit Facility |  |  |
Term loans assumed in Ahana acquisition |  |  |
Maximum borrowing capacity |  |  | 10,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember
Letter of credit sub-facility | Amended Credit Facility | Alltel Mobility Funds |  |  |
Term loans assumed in Ahana acquisition |  |  |
Maximum borrowing capacity |  |  | 25,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = atni_AmendmentToCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember / atni_TypeOfMobilityFundAxis = atni_AlltelMobilityFundsMember
Ahana Debt |  |  |
Term loans assumed in Ahana acquisition |  |  |
Long-term debt | 38,900,000 atni_LongTermDebtNoncurrentCarryingAmount / us-gaap_LongtermDebtTypeAxis = atni_AhanaDebtMember |  |
Ahana Debt | Public Service Electric & Gas |  |  |
Term loans assumed in Ahana acquisition |  |  |
Long-term debt | $ 2,800,000 atni_LongTermDebtNoncurrentCarryingAmount / us-gaap_LongtermDebtTypeAxis = atni_AhanaDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atni_PublicServiceElectricAndGasMember |  |
Effective interest rate (as a percent) | 11.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = atni_AhanaDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atni_PublicServiceElectricAndGasMember |  |
Ahana Debt | Minimum |  |  |
Term loans assumed in Ahana acquisition |  |  |
Effective interest rate (as a percent) | 4.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = atni_AhanaDebtMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Ahana Debt | Maximum |  |  |
Term loans assumed in Ahana acquisition |  |  |
Effective interest rate (as a percent) | 6.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = atni_AhanaDebtMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

X
- Definition Carrying amount of long-term debt, before deducting unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References No definition available. + Details
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