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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Year | $ 25,317 us-gaap_ValuationAllowancesAndReservesBalance | $ 24,692 us-gaap_ValuationAllowancesAndReservesBalance | $ 24,375 us-gaap_ValuationAllowancesAndReservesBalance
Charged to Costs and Expenses | 2,978 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 2,806 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 2,322 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Deductions | 3,189 us-gaap_ValuationAllowancesAndReservesDeductions | 2,181 us-gaap_ValuationAllowancesAndReservesDeductions | 2,005 us-gaap_ValuationAllowancesAndReservesDeductions
Balance at End of Year | 25,106 us-gaap_ValuationAllowancesAndReservesBalance | 25,317 us-gaap_ValuationAllowancesAndReservesBalance | 24,692 us-gaap_ValuationAllowancesAndReservesBalance
Valuation allowance on foreign tax credit carryforwards |  |  |
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Year | 13,576 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceTaxCreditCarryforwardMember | 15,396 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceTaxCreditCarryforwardMember | 16,755 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceTaxCreditCarryforwardMember
Deductions | 2,999 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceTaxCreditCarryforwardMember | 1,820 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceTaxCreditCarryforwardMember | 1,359 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceTaxCreditCarryforwardMember
Balance at End of Year | 10,577 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceTaxCreditCarryforwardMember | 13,576 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceTaxCreditCarryforwardMember | 15,396 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceTaxCreditCarryforwardMember
Valuation allowance on foreign net operating losses |  |  |
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Year | 1,610 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceForeignOperatingLossCarryforwardsMember | 898 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceForeignOperatingLossCarryforwardsMember | 560 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceForeignOperatingLossCarryforwardsMember
Charged to Costs and Expenses |  | 712 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceForeignOperatingLossCarryforwardsMember | 338 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceForeignOperatingLossCarryforwardsMember
Deductions | 110 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceForeignOperatingLossCarryforwardsMember |  |
Balance at End of Year | 1,500 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceForeignOperatingLossCarryforwardsMember | 1,610 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceForeignOperatingLossCarryforwardsMember | 898 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceForeignOperatingLossCarryforwardsMember
Valuation allowance on state net operating losses |  |  |
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Year | 1,126 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceStateOperatingLossCarryforwardsMember | 494 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceStateOperatingLossCarryforwardsMember |
Charged to Costs and Expenses | 561 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceStateOperatingLossCarryforwardsMember | 632 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceStateOperatingLossCarryforwardsMember | 494 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceStateOperatingLossCarryforwardsMember
Balance at End of Year | 1,687 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceStateOperatingLossCarryforwardsMember | 1,126 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceStateOperatingLossCarryforwardsMember | 494 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = atni_ValuationAllowanceStateOperatingLossCarryforwardsMember
Allowance for doubtful accounts |  |  |
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Year | 9,005 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 7,904 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 7,060 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember
Charged to Costs and Expenses | 2,417 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 1,462 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 1,490 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember
Deductions | 80 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 361 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 646 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember
Balance at End of Year | $ 11,342 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | $ 9,005 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | $ 7,904 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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