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Financial Instruments (Proceeds) (Details 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Financial Instruments Proceeds Details 4    
Proceeds from sales and maturities $ 37,862 $ 28,007
Realized gains 7 0
Realized losses $ 0 $ 0