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Fair Value Measurements (Details 3) (Derivatives designated as hedging instruments, Interest rate swap, USD $)
Sep. 30, 2014
Dec. 31, 2013
Derivatives designated as hedging instruments | Interest rate swap
   
Fair Value Measurements    
Fair value of derivatives assets $ 134,000 $ 265,000
Fair value of derivatives liabilities $ 2,062,000 $ 774,000