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GAIN ON SALE OF ASSETS AND AMORTIZATION OF DEFERRED GAINS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
GAIN ON SALE OF ASSETS AND AMORTIZATION OF DEFERRED GAINS [Abstract]
Net gain on lease terminations	$ 40,382us-gaap_GainLossOnContractTermination	$ 21,237us-gaap_GainLossOnContractTermination	$ 21,806us-gaap_GainLossOnContractTermination
Net loss on sale of vessels	(15,762)us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets	(2,109)us-gaap_GainLossOnDispositionOfAssets
Amortization of deferred gains	0us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized	2,321us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized	15,062us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
Gain (loss) on sale of vessels	$ 24,620fro_GainLossOnSaleOfAssets	$ 23,558fro_GainLossOnSaleOfAssets	$ 34,759fro_GainLossOnSaleOfAssets

X

- Definition

The net gain or loss resulting from the sale, transfer, termination, or other disposition of assets during the period and amortization of deferred gains.

+ References

No definition available.

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- Definition

Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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- Definition

The portion of the deferred gain that was recognized in the current period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35688829&loc=d3e50609-112754

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