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Omnibus Incentive Compensation Plan (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 6 Months Ended 8 Months Ended 2 Months Ended 6 Months Ended 9 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Partnerships Omnibus Incentive Compensation Plan [Member]
Jul. 22, 2010
Partnerships Omnibus Incentive Compensation Plan [Member]
Apr. 29, 2008
Partnerships Omnibus Incentive Compensation Plan [Member]
Jun. 30, 2012
Partnerships Omnibus Incentive Compensation Plan Employees [Member]
Aug. 25, 2010
Partnerships Omnibus Incentive Compensation Plan Employees [Member]
Aug. 31, 2010
Partnerships Omnibus Incentive Compensation Plan Non Employees [Member]
Jun. 30, 2012
Partnerships Omnibus Incentive Compensation Plan Non Employees [Member]
Mar. 01, 2010
Crude Carriers Corp. Equity Incentive Plan [Member]
Jun. 30, 2012
Crude Carriers Corp. Equity Incentive Plan [Member]
Sep. 30, 2011
Acquisition of Crude Carriers Corp. by the Partnership - Crude Equity Incentive Plan [Member]
Sep. 30, 2011
Acquisition of Crude Carriers Corp. by the Partnership - Crude Employee Equity Incentive Plan [Member]
Sep. 30, 2011
Acquisition of Crude Carriers Corp. by the Partnership - Crude Non Employee Equity Incentive Plan [Member]
Sep. 30, 2011
Acquisition of Crude Carriers Corp. by the Partnership - Crude Independent Committee [Member]
Jun. 30, 2012
Employee Equity Compensation [Member]
Dec. 31, 2011
Employee Equity Compensation [Member]
Aug. 25, 2010
Employee Equity Compensation [Member]
Jun. 30, 2012
Non Employee Equity Compensation [Member]
Dec. 31, 2011
Non Employee Equity Compensation [Member]
Units / Shares authorized       800,000 500,000         400,000                    
Units granted             448,000 347,200   399,500           0     0  
Number of annual installments           3         3                  
Vesting date of remaining awards                 2013-08-31   2013-08-31                  
Shares exchange ratio                       1.56                
Unvested shares                         205,000 194,400   534,066 536,666   650,464 650,464
Number of units converted                         319,800 303,264            
Vested shares                             20,000 2,600     0  
Number of units vested and converted                             31,200          
Value of unvested units accrued distribution     $ 1,698                                  
Share based compensation 1,991 1,159                           912     1,079  
Total unrecognized compensation cost                               2,138        
Grant date unit price                                   $ 8.08    
Expected period of recognition for unrecognized compensation cost                               1 year 1 month 25 days        
Total unrecognized compensation cost                                     $ 2,380  
Grant date unit price                                     $ 7.56  
Expected period of recognition for unrecognized compensation cost                                     1 year 2 months 0 days