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Investments and Fair Value Measurements (Unrealized Gains on Trading Securities) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Unrealized gains (losses), net $ 269 $ (387) $ 237