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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES-Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Income Taxes |  |
Total revenue earned |  | $ 811
Taxable income | $ (15,600) | (54,230)
Income tax expense |  | 253
Vessel Management Services |  |
Income Taxes |  |
Total revenue earned | 0 | 811
Taxable income |  | 563
Income tax expense | $ 0 | 253
Vessel Management Services | Intersegment Elimination |  |
Income Taxes |  |
Total revenue earned |  | $ 0

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