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Out of Period Adjustments (Details) (Oslo Bulk AS [Member], USD $)
3 Months Ended 9 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2011
Sep. 30, 2012
Jul. 31, 2011
Jun. 30, 2011
Oslo Bulk AS [Member]
           
Schedule of Equity Method Investments [Line Items]            
Equity investee ownership interest (in hundredths)       25.00% 25.00% 25.00%
Amount of ineffectiveness on investment hedges $ 674,000 $ 42,000        
Out of period adjustments related to net charter revenues and lease termination     239,000 324,000    
Gain from out of period adjustments 631,000          
Decrease to pre-tax income       85,000    
Decrease net income       $ 631,000