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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
Statement of Cash Flows [Abstract] |  |  |
Net loss | $ (171,660)us-gaap_ProfitLoss | $ (191,082)us-gaap_ProfitLoss | $ (83,775)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Depreciation | 81,471 us-gaap_Depreciation | 99,823 us-gaap_Depreciation | 114,845 us-gaap_Depreciation
Amortization of deferred charges | 627 us-gaap_AmortizationOfFinancingCosts | 542 us-gaap_AmortizationOfFinancingCosts | 543 us-gaap_AmortizationOfFinancingCosts
Amortization of debt discount | 1,629 us-gaap_AmortizationOfDebtDiscountPremium | 1,820 us-gaap_AmortizationOfDebtDiscountPremium | 0 us-gaap_AmortizationOfDebtDiscountPremium
Contingent rental expense (income) | 4,237 fro_ContingentRentalIncomeExpense | (8,726)fro_ContingentRentalIncomeExpense | 0 fro_ContingentRentalIncomeExpense
Debt conversion expense | 41,067 fro_DebtConversionExpense | 12,654 fro_DebtConversionExpense | 0 fro_DebtConversionExpense
Loss from de-consolidation of subsidiaries | 12,415 us-gaap_DeconsolidationGainOrLossAmount | 0 us-gaap_DeconsolidationGainOrLossAmount | 0 us-gaap_DeconsolidationGainOrLossAmount
Gain from sale of assets (including securities) | (24,620)fro_GainFromSaleOfAssetsAndTerminationOfLeases | (22,711)fro_GainFromSaleOfAssetsAndTerminationOfLeases | (16,813)fro_GainFromSaleOfAssetsAndTerminationOfLeases
Equity (gains) losses of unconsolidated subsidiaries and associated companies, net of dividends received | (3,866)us-gaap_IncomeLossFromEquityMethodInvestments | (13,539)us-gaap_IncomeLossFromEquityMethodInvestments | 4 us-gaap_IncomeLossFromEquityMethodInvestments
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions | 1,847 us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions | 13,539 us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions | (4)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
Impairment losses on vessels | 97,709 us-gaap_ImpairedAssetsToBeDisposedOfByMethodOtherThanSaleAmountOfImpairmentLoss | 103,724 us-gaap_ImpairedAssetsToBeDisposedOfByMethodOtherThanSaleAmountOfImpairmentLoss | 32,042 us-gaap_ImpairedAssetsToBeDisposedOfByMethodOtherThanSaleAmountOfImpairmentLoss
Unrealized foreign exchange loss (gain) | 113 us-gaap_ForeignCurrencyTransactionGainLossUnrealized | 20 us-gaap_ForeignCurrencyTransactionGainLossUnrealized | (3)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Gain on repurchase of convertible bond debt | (1,486)us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | (4,600)us-gaap_GainsLossesOnExtinguishmentOfDebt
Provision for doubtful debts | 68 us-gaap_ProvisionForDoubtfulAccounts | 55 us-gaap_ProvisionForDoubtfulAccounts | 5,370 us-gaap_ProvisionForDoubtfulAccounts
Other, net | (1,375)us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | (529)us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | 168 us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Changes in operating assets and liabilities: |  |  |
Trade accounts receivable | (12,462)us-gaap_IncreaseDecreaseInAccountsReceivable | 11,820 us-gaap_IncreaseDecreaseInAccountsReceivable | 13,557 us-gaap_IncreaseDecreaseInAccountsReceivable
Other receivables | (623)us-gaap_IncreaseDecreaseInOtherReceivables | (567)us-gaap_IncreaseDecreaseInOtherReceivables | (816)us-gaap_IncreaseDecreaseInOtherReceivables
Inventories | 10,736 us-gaap_IncreaseDecreaseInInventories | 8,809 us-gaap_IncreaseDecreaseInInventories | (20,107)us-gaap_IncreaseDecreaseInInventories
Voyages in progress | 5,739 fro_IncreaseDecreaseInVoyagesInProgress | 7,985 fro_IncreaseDecreaseInVoyagesInProgress | (29,648)fro_IncreaseDecreaseInVoyagesInProgress
Prepaid expenses and accrued income | (473)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 449 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 1,430 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Trade accounts payable | (10,204)us-gaap_IncreaseDecreaseInAccountsPayableTrade | 7,327 us-gaap_IncreaseDecreaseInAccountsPayableTrade | 1,819 us-gaap_IncreaseDecreaseInAccountsPayableTrade
Accrued expenses | (1,733)us-gaap_IncreaseDecreaseInAccruedLiabilities | (11,058)us-gaap_IncreaseDecreaseInAccruedLiabilities | (6,632)us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred charter revenue and other current liabilities | (37)us-gaap_IncreaseDecreaseInDeferredRevenue | (4,844)us-gaap_IncreaseDecreaseInDeferredRevenue | (548)us-gaap_IncreaseDecreaseInDeferredRevenue
Related party balances | 26,241 us-gaap_IncreaseDecreaseInDueToRelatedPartiesCurrent | (48,839)us-gaap_IncreaseDecreaseInDueToRelatedPartiesCurrent | 58,397 us-gaap_IncreaseDecreaseInDueToRelatedPartiesCurrent
Other, net | (119)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | 4,183 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | 3,341 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by (used in) operating activities | 55,413 us-gaap_NetCashProvidedByUsedInOperatingActivities | (42,684)us-gaap_NetCashProvidedByUsedInOperatingActivities | 68,574 us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities |  |  |
Change in restricted cash | 8,396 us-gaap_IncreaseDecreaseInRestrictedCash | 19,143 us-gaap_IncreaseDecreaseInRestrictedCash | 13,060 us-gaap_IncreaseDecreaseInRestrictedCash
Additions to newbuildings, vessels and equipment | (44,990)fro_PaymentsToAcquireNewbuildingsVesselsAndEquipment | (2,504)fro_PaymentsToAcquireNewbuildingsVesselsAndEquipment | (14,503)fro_PaymentsToAcquireNewbuildingsVesselsAndEquipment
Proceeds from sale of vessels and equipment | 53,087 fro_ProceedsFromSaleOfVesselsAndEquipment | 0 fro_ProceedsFromSaleOfVesselsAndEquipment | 10,174 fro_ProceedsFromSaleOfVesselsAndEquipment
Loans from (to) associated companies | 0 fro_LoanAdvancedToAssociateCompanies | 250 fro_LoanAdvancedToAssociateCompanies | (250)fro_LoanAdvancedToAssociateCompanies
Investment in associated companies | 0 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates | (6,001)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates | (13,298)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
Proceeds from sale of investment in associated companies | 0 us-gaap_ProceedsFromSaleOfEquityMethodInvestments | 242 us-gaap_ProceedsFromSaleOfEquityMethodInvestments | 0 us-gaap_ProceedsFromSaleOfEquityMethodInvestments
Receipts from finance leases and loans receivable | 2,555 fro_RepaymentsOfInvestmentsInCapitalLeases | 2,156 fro_RepaymentsOfInvestmentsInCapitalLeases | 1,824 fro_RepaymentsOfInvestmentsInCapitalLeases
Impact of re-consolidation of subsidiaries | 638 fro_Cashimpactofreconsolidationofsubsidiaries | 0 fro_Cashimpactofreconsolidationofsubsidiaries | 0 fro_Cashimpactofreconsolidationofsubsidiaries
Proceeds from sale of shares in subsidiaries | 49 us-gaap_ProceedsFromMinorityShareholders | 0 us-gaap_ProceedsFromMinorityShareholders | 0 us-gaap_ProceedsFromMinorityShareholders
Net cash provided by (used in) investing activities | 19,735 us-gaap_NetCashProvidedByUsedInInvestingActivities | 13,286 us-gaap_NetCashProvidedByUsedInInvestingActivities | (2,993)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities |  |  |
Net proceeds from issuance of shares | 52,934 us-gaap_ProceedsFromIssuanceOfCommonStock | 4,802 us-gaap_ProceedsFromIssuanceOfCommonStock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from long-term debt | 30,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 19,798 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repayments of long-term debt, convertible bond buy backs and cash payments of debt conversion | (90,612)us-gaap_RepaymentsOfLongTermDebt | (23,781)us-gaap_RepaymentsOfLongTermDebt | (24,921)us-gaap_RepaymentsOfLongTermDebt
Payment of obligations under finance leases | (39,918)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations | (50,345)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations | (64,068)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Lease termination (payments) receipts, net | (10,500)fro_Receiptspaymentsresultingfromleaseterminations | (4,518)fro_Receiptspaymentsresultingfromleaseterminations | 445 fro_Receiptspaymentsresultingfromleaseterminations
Payment of related party loan note | (6,103)us-gaap_RepaymentsOfRelatedPartyDebt | (402)us-gaap_RepaymentsOfRelatedPartyDebt | 0 us-gaap_RepaymentsOfRelatedPartyDebt
Debt fees paid | (628)us-gaap_PaymentsOfFinancingCosts | 0 us-gaap_PaymentsOfFinancingCosts | 0 us-gaap_PaymentsOfFinancingCosts
Net cash used in financing activities | (64,827)us-gaap_NetCashProvidedByUsedInFinancingActivities | (54,446)us-gaap_NetCashProvidedByUsedInFinancingActivities | (88,544)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents | 10,321 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (83,844)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (22,963)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 53,759 us-gaap_CashAndCashEquivalentsAtCarryingValue | 137,603 us-gaap_CashAndCashEquivalentsAtCarryingValue | 160,566 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year | 64,080 us-gaap_CashAndCashEquivalentsAtCarryingValue | 53,759 us-gaap_CashAndCashEquivalentsAtCarryingValue | 137,603 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information: |  |  |
Interest paid, net of interest capitalized | 76,614 us-gaap_InterestPaidNet | 91,120 us-gaap_InterestPaidNet | 98,991 us-gaap_InterestPaidNet
Income taxes paid | $ 370 us-gaap_IncomeTaxesPaid | $ 493 us-gaap_IncomeTaxesPaid | $ 518 us-gaap_IncomeTaxesPaid

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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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