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Vessels (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Mar. 20, 2013
Hercules Container Carrier Sa
Mar. 27, 2013
Iason Container Carrier Sa
Jun. 30, 2012
M/T Attikos
Jun. 30, 2012
M/T Aristofanis
Dec. 22, 2012
M/V Agamemnon
Dec. 22, 2012
M/V Archimidis
Property Plant And Equipment [Line Items]                    
Fair value of vessels acquired         $ 54,000 $ 54,000     $ 68,000 $ 65,000
Date of vessel sale             Feb. 14, 2012 Apr. 04, 2012    
DWT             12,000 12,000    
Year built             2005 2005    
Net proceeds from sale of vessel 0 19,675         9,807 9,868    
Gain on vessel disposal 0 1,296         943 353    
Vessel carrying value $ 1,042,900   $ 959,550 $ 1,073,986     $ 8,864 $ 9,514