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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Nonrecurring Basis [Member] | Vessels [Member] |  |
Fair Value Measurements [Abstract] |  |
Fair market value of assets |  | $ 12,550
Income Approach [Member] |  |
Fair Value Measurements [Abstract] |  |
Estimated fair value of outstanding debt | $ 1,369,932 | 984,017
Carrying amount of debt | $ 1,399,931 | $ 992,406

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