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Investments in Marketable Securities Available-for sale (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]      
Proceeds from Sales $ 21,792 $ 19,612 $ 25,834
Gross realized gains 17 35 420
Gross realized losses $ (25) $ (32) $ (70)