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Above market acquired charters - Carrying Value (Table) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
M/V Cape Agamemnon
Dec. 31, 2011
M/V Cape Agamemnon
Dec. 31, 2012
M/T Assos
Dec. 31, 2011
M/T Assos
Aug. 16, 2010
M/T Assos
Dec. 31, 2012
M/V Agamemnon
Dec. 31, 2011
M/V Agamemnon
Dec. 31, 2012
M/V Archimidis
Dec. 31, 2011
M/V Archimidis
Acquired Finite Lived Intangible Assets [Line Items]                        
Carrying amount, beginning of period $ 51,124 $ 8,062   $ 45,543 $ 0 $ 5,581 $ 8,062 $ 9,000 $ 0 $ 0 $ 0 $ 0
Acquisitions 4,500 48,551   0 48,551 0 0   2,250 0 2,250 0
Amortization (7,904) (5,489) (938) (5,372) (3,008) (2,488) (2,481)   (23) 0 (21) 0
Carrying amount, end of period $ 47,720 $ 51,124 $ 8,062 $ 40,171 $ 45,543 $ 3,093 $ 5,581 $ 9,000 $ 2,227 $ 0 $ 2,229 $ 0