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Vessels, net (Table) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Vessels (Abstract)      
Vessels carrying amount as at beginning of period $ 1,073,986 $ 707,339  
Acquisitions and improvements 133,105 403,861  
Depreciation (48,235) (37,214) (31,464)
Disposals (156,128)    
Impairment of vessels (43,178) 0 0
Vessels carrying amount as at end of period $ 959,550 $ 1,073,986 $ 707,339