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Vessels, Net, detail (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Vessel Cost |  |  |
Vessel Cost, Beginning Balance | $ 1,224,757 | $ 1,160,911 |
Transfers from Advances for vessel acquisitions and vessel under construction | 100,043 | 119,520 |
Impairment loss |  | (23,924) |
Transfer to Assets held for sale |  | (31,750) |
Vessel Cost,Ending Balance | 1,324,800 | 1,224,757 | $ 1,160,911
Accumulated Depreciation |  |  |
Accumulated Depreciation, Beginning Balance | (236,596) | (200,488) |
Impairment loss |  | 11,025 |
Depreciation | (49,485) | (47,133) | (43,084)
Accumulated Depreciation, Ending Balance | (286,081) | (236,596) | (200,488)
Net Book Value |  |  |
Net Book Value, Beginning Balance | 988,161 | 960,423 |
Transfers from Advances for vessel acquisitions and vessel under construction | 100,043 | 119,520 |
Impairment loss |  | (12,899) |
Transfer to Assets held for sale |  | (31,750) |
Depreciation | (49,485) | (47,133) | (43,084)
Net Book Value, Ending Balance | 1,038,719 | $ 988,161 | $ 960,423
Property Plant And Equipment Collateral For Debt | $ 1,028,059 |  |
Number Of Vessels As Collateral For Debt | item | 36 |  |

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- Definition The aggregate amount of write-downs for impairments, reprezenting the difference between the gross book value and fair value less cost to sell, recognized during the period for property, plant and equipment for abandonment, exchange or sale. + References No definition available. + Details
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