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Investments and Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of investments    
Held-to-Maturity Debt instrument $ 10,668 $ 11,036
Federal agency [Member]
   
Schedule of investments    
Held-to-Maturity Debt instrument $ 10,668 $ 11,036