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Investments and Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of unrealized gains, losses, and fair value of investments    
Held-to- maturity cost or amortized cost $ 11,036 $ 9,056
Held-to- maturity gross unrealized gains 61 53
Held-to- maturity gross unrealized losses (157) (112)
Held-to- maturity fair value $ 10,940 $ 8,997