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Other Operational Gain (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Other Operational Gain [Line Items]    
Other operational gain $ 1,647 $ 140
Several commercial claims
   
Other Operational Gain [Line Items]    
Other operational gain 1,250  
Hull and Machinery Claim
   
Other Operational Gain [Line Items]    
Other operational gain $ 397