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INTEREST RATE SWAP AGREEMENTS (Details 3) (Interest rate contracts, Derivatives in cash flow hedging relationships, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 vessel	Mar. 31, 2012
Interest rate contracts | Derivatives in cash flow hedging relationships
Impact of derivative instruments and their location within Condensed Consolidated Statement of Operations
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	$ (138)	$ (1,779)
Amount of Gain (Loss) Reclassified from AOCI into income (Effective Portion)	(2,439)	(4,532)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion)	(4)	27
Amount of AOCI expected to be reclassified into interest expense over the next 12 months	(8,502)
Number of vessels mortgaged	35
Aggregate amount of collateral	$ 100,000

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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