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Fair Value Measurement Disclosures (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Derivative designated as a cash flow hedging instrument:    
Derivative instruments $ 327 $ 408
Significant other observable inputs (Level 2)    
Derivative designated as a cash flow hedging instrument:    
Derivative instruments $ 327 $ 408