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Above market acquired charters - Carrying Value (Table) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Acquired Finite Lived Intangible Assets [Line Items]      
Carrying amount, beginning of period $ 47,720 $ 51,124 $ 51,124
Acquisitions 39,475   4,500
Amortization (5,579) (3,909) (7,904)
Carrying amount, end of period 81,616   47,720
M/V Cape Agamemnon
      
Acquired Finite Lived Intangible Assets [Line Items]      
Carrying amount, beginning of period 40,171 45,543 45,543
Acquisitions 0   0
Amortization (2,656)   (5,372)
Carrying amount, end of period 37,515   40,171
M/T Assos
      
Acquired Finite Lived Intangible Assets [Line Items]      
Carrying amount, beginning of period 3,093 5,581 5,581
Acquisitions 0   0
Amortization (1,230)   (2,488)
Carrying amount, end of period 1,863   3,093
M/V Agamemnon
      
Acquired Finite Lived Intangible Assets [Line Items]      
Carrying amount, beginning of period 2,227 0 0
Acquisitions 0   2,250
Amortization (429)   (23)
Carrying amount, end of period 1,798   2,227
M/V Archimidis
      
Acquired Finite Lived Intangible Assets [Line Items]      
Carrying amount, beginning of period 2,229 0 0
Acquisitions 0   2,250
Amortization (396)   (21)
Carrying amount, end of period 1,833   2,229
M/V Aristotelis
      
Acquired Finite Lived Intangible Assets [Line Items]      
Carrying amount, beginning of period 0 0 0
Acquisitions 19,707   0
Amortization (471)   0
Carrying amount, end of period 19,236   0
M/V Attalos
      
Acquired Finite Lived Intangible Assets [Line Items]      
Carrying amount, beginning of period 0 0 0
Acquisitions 19,768   0
Amortization (397)   0
Carrying amount, end of period $ 19,371   $ 0