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Derivative Financial Instruments (Details 2) (Derivatives designated as hedging instruments, Interest rate swap, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Derivatives designated as hedging instruments | Interest rate swap
   
Assets Derivatives    
Fair value $ 0 $ 0
Liability Derivatives    
Fair value $ 1,335 $ 923