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Derivatives (Details) (Not Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Not Designated as Hedging Instrument [Member]
   
Summary of derivatives and their fair values    
Notional Amount $ 50,000  
Strike 5.2175%  
Trade Date Oct. 01, 2008  
Maturity Date Oct. 01, 2013  
Fair Value of Derivative Liabilities $ (1,667) $ (523)