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Investments and Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of maturity profile of investments
Held-to-maturity due within one year
Held-to-maturity due one year through five years
Held-to-maturity due five years through ten years	714	727
Held-to-maturity due over ten years	9,954	10,309
Held-to-maturity total	$ 10,668	$ 11,036

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