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VESSELS UNDER CAPITAL LEASE, NET 2 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 vessel	Dec. 31, 2013 vessel
Outstanding Obligations Under Capital Leases: [Abstract]
2015	$ 82,402us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2016	139,256us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
2017	102,451us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
2018	96,292us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
2019	87,690us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter	330,064us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter
Minimum lease payments	838,155us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Less: imputed interest	(194,474)us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
Present value of obligations under capital leases	$ 643,681us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Vessels under capital leases	21fro_VesselsUnderCapitalLeases	24fro_VesselsUnderCapitalLeases
Vessels leased from Ship Finance	17fro_VesselsLeasedFromShipFinance	20fro_VesselsLeasedFromShipFinance
Initial terms of leases, minimum	12 years
Initial terms of leases, maximum	22 years
Remaining periods on these leases, minimum	1 year
Remaining periods on these leases, maximum	12 years

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Amount of minimum lease payments for capital leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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