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Derivative (Details 1) - Other liabilities-non current [Member] - Derivatives qualifying as hedges [Member] - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Notional Amount of Interest Rate Derivatives $ 11,500 $ 13,500
Derivative Liability, Fair Value, Net $ (39) $ (18)