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Long term Debt (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Long term debt [Line Items]      
Weighted average interest rate 3.34% 2.92% 3.25%
Interest expense $ 6,153 $ 7,167 $ 4,698
Amortization of deferred finance charges 522 502 329
Other finance fees 139 169 200
Piraeus Bank S.A.
     
Long term debt [Line Items]      
Write off of unamortized deferred financing fees     $ 307