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Investments and Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of maturity profile of investments
Held-to maturity due within one year
Held-to maturity due one year through five years		250
Held-to maturity due five years through ten years	727	1,134
Held-to maturity due over ten years	10,309	7,672
Held-to maturity total	$ 11,036	$ 9,056

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