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Fair value measurements - Fair value on a non recurring basis - Significant observable inputs (Table) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Interest rate swaps - asset position $ 91 $ 0
Interest Rate Swaps
   
Derivative [Line Items]    
Interest rate swaps - asset position $ 91 $ 0