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VESSELS AND EQUIPMENT, NET (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 Vessels | Dec. 31, 2011 Vessels | Dec. 31, 2010
Components of vessels and equipment, net: |  |  |
Net book value | $ 573,615,000 | $ 1,203,003,000 |
Depreciation and amortization expense | 85,524,000 | 70,286,000 |
Vessels and equipment |  |  |
Components of vessels and equipment, net: |  |  |
Cost | 771,945,000 | 1,584,365,000 |
Accumulated depreciation and amortization | (198,330,000) | (381,362,000) |
Number of owned shipping vessels | 6 | 9 |
Depreciation and amortization expense | 70,300,000 | 54,300,000 | 52,800,000
Drydocking |  |  |
Components of vessels and equipment, net: |  |  |
Cost | 34,200,000 | 39,800,000 |
Accumulated depreciation and amortization | (12,900,000) | (12,100,000) |
Office equipment |  |  |
Components of vessels and equipment, net: |  |  |
Cost | 1,800,000 | 1,700,000 |
Vessels |  |  |
Components of vessels and equipment, net: |  |  |
Amounts pledged as collateral | $ 432,900,000 | $ 1,188,000,000 |

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- Definition Cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land or leased assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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