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OTHER COMMITMENTS AND CONTINGENCIES (Details)	0 Months Ended	12 Months Ended	96 Months Ended
OTHER COMMITMENTS AND CONTINGENCIES (Details)	Dec. 31, 2011 USD ($) tax_lease	Dec. 31, 2003 GBP (£) tax_lease	Dec. 31, 2011 USD ($) tax_lease	Dec. 31, 2010 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Book value of vessels secured against long-term loans and capital leases	$ 1,703,196,000		$ 1,703,196,000	$ 1,616,814,000
Tax lease benefits:
Number of tax leases	1	6
Gross amount received from tax lease benefit (in GBP)		41,000,000
Number of tax leases terminated			5
Number of tax leases, accrue benefits over term of lease			2
Other commitment to pay third party	$ 1,000,000		$ 1,000,000

The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position.

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