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Vessels (Table) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Vessels (Abstract)    
Vessels carrying amount as at beginning of period $ 959,550 $ 1,073,986
Acquisitions and improvements 108,000 133,105
Disposals   (156,128)
Impairment of vessels   (43,178)
Depreciation (24,650) (48,235)
Vessels carrying amount as at end of period $ 1,042,900 $ 959,550