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Acquisition of Crude - Additional Information (Table) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2011
Jun. 09, 2011
Sep. 30, 2011
Units issued to Crude Carriers Corp shareholders
Dec. 31, 2011
Crude Carriers Corp
Sep. 30, 2011
Crude Carriers Corp
Sep. 30, 2011
Acquisition Of Crude Carriers Corp By Partnership Crude Employee Equity Incentive Plan
Jun. 30, 2011
Partnership Units
Sep. 30, 2011
Partnership General Partner
Jun. 09, 2011
Partnership General Partner
Dec. 31, 2011
Capital General Partners
Business Acquisition [Line Items]                          
Purchase price consideration for the acquisition of Crude Carriers Corp - units issued to Crude Carriers Corp shareholders           $ 155,559   $ 157,064          
Common units issued           24,344,176       142,000      
Shares exchange ratio               1.56          
Purchase price consideration of Crude Carriers Corp - fair value attributable to precombination services of Crude Carriers Corp Equity Incentive plan                 1,505        
Number of Crude Carriers' Corp incentive plan shares                 399,400        
Number of Partnership units after the conversion of Crude Carriers' Corp incentive plan shares                 623,064        
Number of general partner units converted                     499,346 142,000  
Interest of CGP in the partnership                         2.00%
Acquisition related costs               4,225          
Common unit price         $ 8.2     $ 6.39          
Common unit price used to determine the exchange ratio of the unit for share transaction       $ 10.35       $ 11.27          
Charter Revenues 84,012 98,517 113,562       13,327            
Net (loss) / income $ (21,189) $ 87,120 $ 18,919       $ 1,399