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INTEREST RATE SWAP AGREEMENTS (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
INTEREST RATE SWAP AGREEMENTS [Abstract] |  |  |  |  |
Number of interest rate swap agreements outstanding | 4 |  | 4 |  | 5
Derivative [Line Items] |  |  |  |  |
Number of interest rate swaps previously classified as a long-term liability | 1 |  | 1 |  |
Amount of AOCI expected to be reclassified into interest expense over the next 12 months | $ (6,012) |  | $ (6,012) |  |
Number of vessels mortgaged | 35 |  | 35 |  |
Notional amount outstanding | 306,233 |  | 306,233 |  | 356,233
Aggregate amount of collateral | 100,000 |  | 100,000 |  |
Asset Derivatives [Abstract] |  |  |  |  |
Total Derivatives | 0 |  | 0 |  | 0
Liability Derivatives [Abstract] |  |  |  |  |
Fair value of derivative instruments (Current Liabilities) | 9,292 |  | 9,292 |  | 7
Fair value of derivative instruments (Noncurrent Liabilities) | 0 |  | 0 |  | 16,045
Total Derivatives | 9,292 |  | 9,292 |  | 16,052
Designated as Hedging Instrument [Member] |  |  |  |  |
Asset Derivatives [Abstract] |  |  |  |  |
Total Derivatives | 0 |  | 0 |  | 0
Liability Derivatives [Abstract] |  |  |  |  |
Total Derivatives | 9,292 |  | 9,292 |  | 16,052
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Asset Derivatives [Abstract] |  |  |  |  |
Fair value of derivative instruments (Current Assets) | 0 |  | 0 |  | 0
Fair value of derivative instruments (Noncurrent Assets) | 0 |  | 0 |  | 0
Liability Derivatives [Abstract] |  |  |  |  |
Fair value of derivative instruments (Current Liabilities) | 9,292 |  | 9,292 |  | 7
Fair value of derivative instruments (Noncurrent Liabilities) | 0 |  | 0 |  | 16,045
Impact of Derivative Instruments and Location in Income Statement [Abstract] |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) | (439) | (1,434) | (668) | (3,999) |
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member] | Interest Expense [Member] |  |  |  |  |
Impact of Derivative Instruments and Location in Income Statement [Abstract] |  |  |  |  |
Amount of Gain (Loss) Reclassified from AOCI into income (Effective Portion) | (2,515) | (2,959) | (7,431) | (10,392) |
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member] | Other Income (Expense) [Member] |  |  |  |  |
Impact of Derivative Instruments and Location in Income Statement [Abstract] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion) | 2 | 30 | (3) | 76 |
Interest Rate Swap, 4.485% [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount outstanding | 106,233 |  | 106,233 |  | 106,233
Fixed rate (in hundredths) | 4.485% |  | 4.485% |  |
Interest Rate Swap, 5.25% [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount outstanding | 50,000 |  | 50,000 |  | 50,000
Fixed rate (in hundredths) | 5.25% |  | 5.25% |  |
Interest Rate Swap, 5.075% [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount outstanding | 0 |  | 0 |  | 50,000
Fixed rate (in hundredths) | 5.075% |  | 5.075% |  |
Interest Rate Swap, 2.05% [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount outstanding | 100,000 |  | 100,000 |  | 100,000
Fixed rate (in hundredths) | 2.05% |  | 2.05% |  |
Interest Rate Swap, 2.45% [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount outstanding | $ 50,000 |  | $ 50,000 |  | $ 50,000
Fixed rate (in hundredths) | 2.45% |  | 2.45% |  |

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