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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 8,099us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 10,488us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 109,982us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation and amortization 78,014us-gaap_DepreciationDepletionAndAmortization 77,301us-gaap_DepreciationDepletionAndAmortization 70,908us-gaap_DepreciationDepletionAndAmortization
Loss on early extinguishment of debt   3,660us-gaap_GainsLossesOnExtinguishmentOfDebt 5,112us-gaap_GainsLossesOnExtinguishmentOfDebt
Gain on sale of property   (6,546)us-gaap_GainLossOnDispositionOfAssets1  
Employee retirement benefits (12,078)hwtl_PensionAndOtherPostretirementBenefitExpenseNetOfContributionsPaid (13,224)hwtl_PensionAndOtherPostretirementBenefitExpenseNetOfContributionsPaid (11,933)hwtl_PensionAndOtherPostretirementBenefitExpenseNetOfContributionsPaid
Provision for uncollectibles 3,590us-gaap_ProvisionForDoubtfulAccounts 3,455us-gaap_ProvisionForDoubtfulAccounts 716us-gaap_ProvisionForDoubtfulAccounts
Stock based compensation 4,174us-gaap_ShareBasedCompensation 2,736us-gaap_ShareBasedCompensation 1,872us-gaap_ShareBasedCompensation
Deferred income taxes 6,851us-gaap_DeferredIncomeTaxExpenseBenefit 9,617us-gaap_DeferredIncomeTaxExpenseBenefit (90,827)us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:      
Receivables (1,731)us-gaap_IncreaseDecreaseInReceivables (3,409)us-gaap_IncreaseDecreaseInReceivables (724)us-gaap_IncreaseDecreaseInReceivables
Material and supplies (386)us-gaap_IncreaseDecreaseInInventories (4,587)us-gaap_IncreaseDecreaseInInventories (3,161)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets (504)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 456us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,109)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses 3,882us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (6,518)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 3,255us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Advance billings and customer deposits (1,436)us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits 138us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits 424us-gaap_IncreaseDecreaseInCustomerAdvancesAndDeposits
Other current liabilities (296)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 812us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 269us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Other, net 2,224us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 2,582us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 1,676us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities 90,403us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 76,961us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 86,460us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Capital expenditures (96,706)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (86,290)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (77,713)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisitions, net of cash acquired   (11,858)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (8,343)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Proceeds on sale of property   13,118us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment  
Proceeds on sale of investments     746us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Net cash used in investing activities (96,706)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (85,030)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (85,310)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Repayment of debt including premium (3,000)us-gaap_RepaymentsOfLongTermDebt (303,083)us-gaap_RepaymentsOfLongTermDebt (306,750)us-gaap_RepaymentsOfLongTermDebt
Proceeds from borrowing   298,500us-gaap_ProceedsFromIssuanceOfLongTermDebt 295,500us-gaap_ProceedsFromIssuanceOfLongTermDebt
Loan refinancing costs   (3,442)us-gaap_PaymentsOfLoanCosts (4,130)us-gaap_PaymentsOfLoanCosts
Proceeds from installment financing 4,336us-gaap_ProceedsFromIssuanceOfCommonStock    
Repayments of capital lease and installment financing (3,179)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (542)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (582)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Taxes paid related to net share settlement on equity awards (1,520)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (806)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (258)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Net cash used in financing activities (3,363)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (9,373)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (16,220)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net change in cash and cash equivalents (9,666)us-gaap_NetCashProvidedByUsedInContinuingOperations (17,442)us-gaap_NetCashProvidedByUsedInContinuingOperations (15,070)us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents, beginning of period 49,551us-gaap_CashAndCashEquivalentsAtCarryingValue 66,993us-gaap_CashAndCashEquivalentsAtCarryingValue 82,063us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period $ 39,885us-gaap_CashAndCashEquivalentsAtCarryingValue $ 49,551us-gaap_CashAndCashEquivalentsAtCarryingValue $ 66,993us-gaap_CashAndCashEquivalentsAtCarryingValue