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Financial Instruments 2 (Details)
Jun. 30, 2014
vessel
Dec. 31, 2013
vessel
Concentration Risk [Line Items]    
Number of newbuildings under construction 6 4
Shanghai, China [Member]
   
Concentration Risk [Line Items]    
Number of newbuildings under construction 9  
Japan Marine United Corporation, Japan [Member]
   
Concentration Risk [Line Items]    
Number of newbuildings under construction 4  
Daehan Shipbuilding Co. Limited, Korea [Member]
   
Concentration Risk [Line Items]    
Number of newbuildings under construction 2  
Bohai, China [Member]
   
Concentration Risk [Line Items]    
Number of newbuildings under construction 2