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INVESTMENTS (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Investments |  |  |  |  |
Fair value of investment in capital stock | $ 27,315 |  | $ 27,315 |  | $ 20,988
Jinhui Shipping and Transportation Limited |  |  |  |  |
Investments |  |  |  |  |
Investment in the capital stock of Jinhui (in shares) | 16,335,100 |  | 16,335,100 |  | 16,335,100
Fair value of investment in capital stock | 27,315 |  | 27,315 |  | 20,988
Impairment of investment | $ 0 | $ 0 | $ 0 | $ 0 |

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