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Other Operational Gain (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Operational Gain [Line Items]      
Other operational gain $ 3,507 $ 9,260 $ 26,648
Hull and Machinery Claim
      
Other Operational Gain [Line Items]      
Other operational gain 812 260  
TMT Co
      
Other Operational Gain [Line Items]      
Other operational gain     21,648
Oldendorff Gmbh & Co. KG
      
Other Operational Gain [Line Items]      
Other operational gain   9,000  
Bhatia International Ltd.
      
Other Operational Gain [Line Items]      
Other operational gain 2,514    
Korea Line Corporation
      
Other Operational Gain [Line Items]      
Other operational gain 157    
Sale of 45% interest in future commercial claims proceeds
      
Other Operational Gain [Line Items]      
Other operational gain     $ 5,000