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Above market acquired charters - Carrying Value (Table) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
M/V Cape Agamemnon
Dec. 31, 2011
M/V Cape Agamemnon
Jun. 30, 2012
M/T Assos
Dec. 31, 2011
M/T Assos
Aug. 16, 2010
M/T Assos
Acquired Finite Lived Intangible Assets [Line Items]                
Carrying amount, beginning of period $ 51,124 $ 8,062 $ 8,062 $ 45,543 $ 0 $ 5,581 $ 8,062 $ 9,000
Acquisition     48,551   48,551      
Amortization (3,909) (1,538) (5,489) (2,672) (3,008) (1,237) (2,481)  
Carrying amount, end of period $ 47,215   $ 51,124 $ 42,871 $ 45,543 $ 4,344 $ 5,581 $ 9,000